Continuity mistake: Near the end, when the hitman walks out of the diner, the camera focuses on the car in the parking lot, cuts back to the hitman, then cuts back to the car. The problem is the shadows in the first shot of the car are about half a meter long, but a few seconds later they are two meters long. Obviously both takes of the car were taken hours apart.
Continuity mistake: During the scene where Chaplin's brother is negotiating a deal for him, Chaplin and the secretary are having a conversation. During this conversation each of their tables has flowers on them. However, each time there is a close camera shot over their table the flower disappears and then reappears over and over. (00:46:40 - 00:47:55)
Continuity mistake: There is a scene where Goodman is in the establishment where his future wife is working. There is a shot where it shows his beer glass with about 2 inches of head on it. The angle changes and in a matter of seconds, the head on the beer is gone.
Continuity mistake: When Norman fishes with Paul for the first time after returning from Dartmouth, his fly reel changes three times in one scene. The first view of the reel it's a brand new Pflueger reel. The next view it's a worn and beat up reel. And the final view it's a Hardy reel.