Testimony of Evil (Dead Men Don't Laugh) - S1-E6
Continuity mistake: At the start, the glass on the left is poisoned. The guy picks up the glass on the right, but still ends up dying.
Police Squad! (1982)
1 mistake in Testimony of Evil (Dead Men Don't Laugh)
Starring: Leslie Nielsen, Alan North, Ed Williams, Rex Hamilton
Frank: Is there a ransom note?
Ed: Yes, the butler found it; it was tied to this window and thrown into the rock garden. I sent the note to the lab; they're demanding one million dollars.
Frank: Why would the lab demand a million dollars?