Revealing mistake: If Rob and Laura actually did dye their hands not only would their hands be black but so would their wedding rings. Also, while Laura is "using water" on her hands you can tell she wasn't using water or soap because her hands aren't wet and there isn't any soap to be seen at all... You only see the dish rag. (Same for when Rob does the same thing later on). (00:06:07)
The Dick Van Dyke Show (1961)
1 revealing mistake in A Show of Hands - chronological order
Starring: Dick Van Dyke, Mary Tyler Moore, Morey Amsterdam, Larry Mathews, Rose Marie
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).
Laura Petrie: You wanna end up another Dwight Heatherton, go ahead.
Rob Petrie: Who's that?
Laura Petrie: Dwight Heatheron happens to be an excellent writer who is unknown because he gets no publicity.
Rob Petrie: Then how do you know him?
Laura Petrie: Oh Rob, he's famous.
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