Revealing mistake: When Max crashes through the wall in the prologue, you can easily tell it's a stunt double. You don't even need freeze frame to see it, as the screen freezes, stylistically fades, then the title sequence starts.
Get Smart (1965)
1 revealing mistake in Pheasant Under Glass - chronological order
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