Other mistake: In the opening credits, character actor Andreas Malandrinos has his last name (as it happened not infrequently throughout his career) misspelled as "Melandrinos" (00:02:55)
Other mistake: A little more than halfway through the movie, they are robbing the train cars by uncoupling and switching the switch direction back and forth to direct the unwanted engine and caboose to the left branch. He switches the switch to go right for the wanted cars and forgets to switch it for the caboose. If you look at the tracks of the switch, it is already set for the train to go left. He then remembers to change the switch and the caboose goes left where it would have already gone.
Continuity mistake: Henry Miller at the beginning of the movie is mooching a few Francs to go out with his wife who just arrived in town. As he is trying to get a few from Boris, Mona's hair keeps changing position in front or behind her shoulders.
Visible crew/equipment: When the police investigator is speaking with the man standing outside the store window and asks him if he would buy every tie in the store, in every close-up shot of the investigator, the reflection of the cameraman kneeling on the ground can be seen in his sunglasses. (01:08:25)
Visible crew/equipment: When Mike and Susan prepare to start putting pieces of snow in the kettle, in the shot where Susan hands Mike the kettle, and he begins taking the lid off, the camera crew can be seen reflected on the kettle. (01:16:00)