When Sam is on the train, he is pushed violently through the rails, cabin doors, but hits his head on the last cart.
When Sam and Molly were fooling around with the pottery wheel, they, quite naturally, had clay all over their hands and up to, and even above, their elbows. In the immediately following love scene, however, their hands and arms are squeaky clean.
When Sam is following Willie to his apartment, Willie opens up the door and after Sam goes through the door, it automatically closes, but when Carl visits Willie, the door remains open.
After Sam and Oda Mae give the check to the nuns, Oda Mae has walked away from Sam and into a crowd. There is a woman walking past Oda Mae and towards Sam. She has a briefcase, a long skirt, gray jacket, and a short Afro hair style. Cut to Sam who is shouting to Oda Mae, and we see the same woman walking past Sam and towards Oda Mae.
When Willie goes to Oda Mae's psychic shop and Oda Mae runs into another room and he shoots at her, the door breaks from the gun shot. After Willie leaves and it shows Oda Mae on the other side of the door, the door is no longer broken.
While inspecting Carl's dummy account, Sam notices that there is too much money in them. This should actually not be difficult to investigate. All transactions on the account would have been logged, including whichever bank employee logged in to manage those accounts. There should have been no mystery about the fact that it was Carl.
With the closing credits the spelling of "Cemetery Ghost" is wrong. The credits spell it as Cemetary Ghost, the correct spelling should be CEMETERY.
At the hospital, Sam sees several doctors trying to resuscitate a dying man. They are not wearing their masks or gloves.
When Sam goes through the man's head in the hospital and when he goes through the door, he sees red stuff. It should be totally black since no light should be in there.
There are a number of inconsistencies concerning Sam touching things when his hands should have gone through. For example, when Sam is in the hospital after his murder he gets out of the chair by grabbing hold of the arm-rests to push himself up out of the chair. However, these could be explained that those things he is trying to intentionally manipulate require concentration, but things that he's used to doing or doing without thought don't require concentration at all as they are instinctively easy.
In the exchange between Molly and Lyle the bank officer, she asks him if that was Oda Mae, and wanted to know what business they had just done. Lyle tells Molly her name (Rita Miller) and said that she was closing an account. By federal law, bank personnel can never discuss the details of one customer's transaction or identity with another. However, Lyle is a "social moron," very likely to have forgotten or not cared enough about the law to keep himself from discussing it with Molly, or intently believing that, because Sam was a bank employee, he could freely discuss it with Molly without fear.
When the ghost of Orlando enters Oda Mae's body, he speaks to his widow Ortisha as if it's the first time he's seen her with the new hair color but he was standing alongside the séance and fully able to see Ortisha all the while.
The idea might have been that this was how Ortisha's deceased husband had always talked to her whenever she returned from the hair-dresser, and so he was speaking the same way now in order to prove to her that he actually was communicating with her.
When Sam is shot and Molly is holding him, her sleeves are covered in blood. Later, at the police station her sleeves are clean.
Possible explanation: The police might have asked Molly to get cleaned up before she was interviewed.
Willy Lopez apparently has no connection to the drug-dealers whom Carl is working with, since Carl has to explain to Willy who they are and what will happen if he doesn't get his job done. Lopez also has no police record. How then does someone like Carl --- a wealthy banker --- find someone like Willy --- a criminal in a low-rent part of town --- to steal a code book from Sam?
Most likely the sleazy folks whom Carl was dealing with were well-acquainted with all of the local low-life --- especially the level-headed and disciplined ones who could "get in and out cleanly" --- who could do "jobs" for them. And Willy did indeed seem quite cool and professional, and thus it's entirely possible that he'd always evaded capture and avoided being connected with any of his past crimes.
Though he's supposed to be a ghost, Sam casts shadows throughout the film.
When Sam says the line "Word for word." Though he isn't in the shot, you can hear Patrick Swayze banging his finger on a hard surface in the background to emphasize Sam's point at that moment. Obviously the sound editors forgot to remove the sound of his finger from the dialog recorded on set.
When Willie is fighting with Sam just prior to shooting him you can see that the gun Willie is using (Walther PPK or similar clone) is in the safe position (i.e. manual safety/decocker is vertical rather than horizontal). Such a gun should not fire.
When "Oda Mae" and "Molly" are straddling the rafters, they are obviously stunt doubles.
About 15 minutes, It's 2:00 AM and Molly can't sleep. A love song is playing on their jukebox. She is spinning a light gray (almost white) clay sculpture when Sam comes up behind her. He starts "helping" her with the clay, making a mess in the process. They start fooling around while still having their arms and hands covered with water & wet clay. Only a moment later, Sam picks her up and lays her in bed. However, their arms and hands are now completely clean; no trace of anything can be seen where there once was water and clay. The song ends and the lights dim. As the song playing is like a clock (if you will), they had no time to wash off anything off screen (plus they never stopped embracing). This is clearly an error.
When Molly and Oda Mae climb the ladder and walk the rafters, both Molly and Carl can be heard shouting, but neither moves their mouth.
In the beginning Sam and Molly's new house has lots of mirrors, the mirrors then show some microphones and sound equipment. Which is seen twice.
When Carl is preparing the account for "Rita Miller", the camera and operator are reflected in the computer screen.
Camera and TV monitor can be seen in the bottom of the mirror in the move-in scene. Stage light equipment can be seen in the mirror soon after Carl passes in front of it.
We are told that Willie Lopez lives in Prospect Place. But when we see him go home when Sam follows, he gets off the J train in Bushwick. Also there is no J train at Franklin St in downtown Manhattan. You would have to take the 1 train.
As with many films involving the perspective of ghosts, Sam and other spirits pass through objects directly in their path, but do not fall through floors, stand solid on top of structures, sitting down on the ground and in chairs, and can be seen climbing stairs and riding in vehicles. This is mainly due to special effect budgets where it is easier to depict a ghost moving about as a person does, rather than floating as a spectral form.
When Carl shoots his way into Molly's apartment, why does he need to force entry? He already has a key, which he used earlier to enter the apartment and take Sam's notebook.
When Sam asks Oda Mae to get some of her fake ID's. He couldn't have possibly known that was mentioned at the police station as he wasn't there.
Carl hires Willie to mug Sam to get his wallet, presumably without killing him. However, had Sam lived, he would immediately have reported his code book missing, and the bank would have changed those codes. Carl would not have had enough time to conduct any transactions, as he is not called upon by his employers to do so until shortly before the end of business, several days after Sam's funeral.
Carl finds Sam's code book in a shoe box. He could easily have taken it earlier, or told Willie exactly where to find it, since he helped Molly pack up that shoe box himself.
Willie Lopez returns home and calls someone (presumably Carl) to tell him he couldn't get Sam's code book, because Molly came back home. But Molly was only out of the apartment because Carl coaxed her into leaving, and she wasn't gone for very long. So, Carl should know that he wouldn't have had enough time to get the booklet, and he should have known that Molly was coming back home when they parted company.
In the credits, Bruce Jarchow is credited as Lyle Furgeson, but the scene at his desk has a sign with the spelling of his name changed to Ferguson.