Starring: Dick Van Dyke, Mary Tyler Moore, Morey Amsterdam, Larry Mathews, Rose Marie
A Vigilante Ripped My Sports Coat - S4-E5
Continuity mistake: Right before Rob starts the story to Sally and Buddy about how Jerry ripped Rob's sports coat, the box is on the floor. When we cut back to Rob, Buddy and Sally later on. The box isn't even in the room anymore. Then later on when Mel comes to pick up the box, it's back on the floor again.
It May Look Like a Walnut! - S2-E20
Character mistake: Rob is having a nightmare, part of which involves the disappearance of his thumbs. When he finds Laura at home, the script calls for him to say, "I want you to help me get my thumbs back," but he actually says, "I want you to help me get my thumb backs." His thumbs are also still there but hidden (you can see a portion of them in one frame of the episode).
Rob Petrie: I want to take a nap before I go to sleep.