Continuity mistake: In the scene where Frank is pulling down the second suitcase of money from the top of the bed canopy while talking frantically to Brenda, the large portion of the suitcase is initially on top when the suitcase is put on the bed. But when the camera returns to another shot of the suitcase as Frank is opening it, the large portion of the suitcase is on the bottom.
Continuity mistake: In the scene where Frank Jr. gives car keys in a small gift box to his dad in a restaurant, his dad puts the car keys back into the small gift box and places it on the table in front of Frank. In the next few shots the gift box is sometimes completely closed and sometimes a little bit open (as if the keys got stuck in between).
Continuity mistake: In the scene where Frank's parents have been informed of their son's impersonation of a French teacher, Frank is seen through the window of the office. At this point, when he flashes a cheesy grin, his hair is a mess - presumably to remind us that he is still only a young, cheeky schoolboy. However, upon his parents leaving the office, Frank's hair is perfectly styled again in a neat side parting.
Continuity mistake: In the scene where Frank is pretending to be a Doctor at the bedside of the kid who has just had a bicycle accident a nurse hands him a swab. While he talking to the other Doctors the swab is visible but when the shot changes his arms are suddenly folded and we can no longer see it.
Continuity mistake: In the scene where Handratty is arresting Frank in France, Frank is about to run out the door with the cheques and Handratty says he will be killed if he runs out. As Frank walks back toward Handratty , Frank's arm position as he's holding the cheques goes from right-over-left to left-over-right as the shot changes, and the cheques are piled in his arms completely differently from one shot to the next.