Corrected entry: Season 2 Episode 17, "Someone Down Here Hates Me": When Siegfried is yelling at his people, he calls them fools, incompetents, bunglers, and dummkopfs. But the plural form of the German 'Dummkopf' is not 'Dummkopfs'- it's 'Dummköpfe' - a mistake a man with German background like Siegfried would never make. (00:03:15)

Get Smart (1965)
1 corrected entry in show generally
Starring: Barbara Feldon, Don Adams, Edward Platt, Robert Karvelas
School Days - S1-E3
Revealing mistake: When Max is being attacked with throwing knives, one is thrown into the closet door. Watch closely; the wire used to guide the knife is visible.
School Days - S1-E3
Max: When the moon is full, the tide is high.
Old Lady: You must want the spy school, that's next door.
More trivia for Get Smart
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Correction: Well Seigfried has proven himself on nearly every episode to be somewhat of an idiot. So not knowing how to say a german word properly is hardly a stretch for him.
Gavin Jackson