Continuity mistake: In the title sequence a Rube Goldberg machine can be seen. The error can be seen by watching the four revolvers rotating and then a single revolver firing. When you look at all four revolvers, there are hand grips in each one, but in the closeup shot of one actually firing, the hand grip is empty. You can't see it later than S5E18 because they decided to delete the frames when you can see all four revolvers, and left only closeups.

Elementary (2012)
1 mistake in show generally
Starring: Aidan Quinn, Jon Michael Hill, Jonny Lee Miller, Lucy Liu
Sherlock Holmes: If you eliminate the impossible, whatever remains, however improbable, is the truth.
Trivia: When Mycroft mentions a conversation between Sherlock and their father that he once overheard, the content of said conversation is how Sherlock describes Mycroft to Watson in "The Adventure of the Greek Interpreter."
The Rat Race - S1-E4
Question: I don't see her listed on the credits in beginning or any other website inquiries, but is that Tyne Daly playing the character Peter's secretary?
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Answer: I'm the same person who asked this question. I discovered it was Molly Price whom I recognized from Third Watch.
Cathrine R
It should be noted Donna was Jim Fowkes‘ secretary. Donna killed Peter.
Bishop73