After Maj. Gruver has dinner with Hana-ogi, he puts the dish and the chopsticks on the table twice.
After the doctor examines him, Maj. Gruver buttons the left coat sleeves and after the right sleeve, keeping his left hand handling the right sleeve. In the next shot he is handling the left sleeve with his right hand.
When Maj. Gruver steps down from the airplane in Kobe's airport, he is carrying a suitcase and an overcoat. But when he approaches to Gen. Webster and wife, all his baggage disappears.
When Maj. Gruver is lying on a bent tree, we see him putting his right hand in his pocket. The next shot shows him with his both hands on his belly.
In the Kelly's house room, in front of the mirror, Maj. Gruver puts his both hands in his pockets. Next shot he is touching his wrist watch with his right hand.
Major Gruver, said to be a West Point graduate is shown wearing his class ring on his right hand. Academy graduates always wore their class rings on their left hand, a mark of distinction.
When General Webster tells Major Gruver that he's being shipped back to the States, he says that he's being sent to "Randolph Field." This is an mistake because Randolph Field was renamed Randolph Air Force Base on January 13, 1948 and this movie takes place during the Korean War (1950-1953), more than two years later.
In the last scene, when Major Gruver is leaving with Hana-Ogi and they are making their way to a car, Marlon Brando looks directly at the camera.
At about 27:30 into the movie, Gruver passionately kisses Eileen, who is wearing a heavy coating of bright red lipstick. Though they kiss lips to lips, when Gruver's face is shown just a second after the kiss, not one bit of lipstick is on his lips.
When Eileen and Major Gruver visit Nakamura backstage, Gruver says he thought the kabuki performance could have used Marilyn Monroe, and Nakamura allows that he too is a fan of Miss Monroe. In 1957, when the movie was filmed, this conversation would have made sense. But it takes place in 1951, at a time when Marilyn Monroe was still a small-part player, little known to the public. It is highly unlikely that even Gruver would have known who she was, and impossible that Nakamura would have, that early in her career.
Most of the movie was filmed in Kyoto, not Kobe.
Several times during the movie salutes are improperly exchanged between officers and between officers and enlisted. Military protocol requires the salute of the junior officer to be held until returned by the senior officer. The same thing applies when an enlisted man salutes an officer of any rank.