During the brawl with the Nazi gang, Martin suffers a pronounced bruise on his right cheek. However, the next day when Freya visits Martin and apologizes for the brawl the previous evening, there is no sign of a bruise on his face nor of a fight.
When Otto, Erich, and his Nazi friends leave their home, the entrance door is closed. However, in the following cut, as Martin walks Freya toward the door, the door is now open.
When Martin accompanies Freya up the stairs and to her door, she plants herself behind the half-open door while peeking out at Martin as he leaves. However, in the following cut when Martin walks toward her brothers' Nazi gang and a brawl breaks out, Freya is now considerably in front of the door and stairs.
After the tree that Martin has just chopped falls, he picks up his axe and starts walking. In the next immediate cut, a St. Bernard is just behind him. However, in the previous shot of the fallen tree which is a long shot, the dog isn't seen.
The famous book-burning that went on in Germany in 1933 did not happen until May 1933, while the movie is set in winter during January and February.
Although the story takes place in 1933, Margaret Sullavan's hairstyle and clothing are in the 1940 mode.