Character mistake: Shonte Jr. says he can't figure out of the atomic mass of a deuteron. He is supposedly a genius, but this is chemistry 101. Average people might not know how to calculate atomic mass, but a genius would not make a beginning level error like this.
Revealing mistake: Charlie tells Irene to jump from the moving train when he can't catch up to it. When Irene jumps, the train is standing still. It only appears to be moving because of clever camera manipulation. (00:58:00)
Continuity mistake: In the scene where the three Baileygates brother's are in a field with tents etc, helping the police to track down their father, Lee Harvey is wearing a plain grey vest. In alternating shots the vest changes to one with black edging, and then back to plain grey again. (00:47:30 - 00:48:40)
Revealing mistake: When Hank crashes the car through the shop, look at the barber's chair. You can see it's a stunt double for the actor.
Continuity mistake: When Dickie is in Hank's and Irene's train cabin, Irene hits him over the head and he lands on top of Hank. You can see his head is behind Hanks shoulder, but when Hank wakes up Dicky's head is next to Hanks. (01:25:45)
Continuity mistake: After Hank has conned Irene into sleeping with him, the morning after Irene finds the "Coke" machine smashed up. In a later scene the Coke machine is back in perfect condition.
Continuity mistake: When Charlie/Hank and Irene arrive at the train station in Rhode Island. Charlie and Hank are having a "fight", during this fight Hank unzips his pants to wiggle his "thing" at a group of ladies sitting on a bench. Immediately after that he falls to the ground and his pants are zipped. (01:28:40)
Continuity mistake: In the scene where Charlie is being chased through the train station and gets shot in the arm look out for a boy in the train station with a green top because immediately after he exits the station the boy is sitting on a bench outside. (01:29:45)