The Monkees (1966)

The Chaperone - S1-E9

Revealing mistake: The purple dress that Micky and Davy bring for Mrs. Weefers to wear is too big for her, showing that the dress was made specifically for Micky to wear.

Peter: Oh no, foot prints! Someone else is on this island.
Micky: Oh don't worry, those are ours, we don't have a larger set so we had to use the same one twice.

The Success Story - S1-E6

Trivia: When Micky (disguised as airline personnel) is talking to Davy's grandfather at the airport, the board behind him states that one of the flights is going from Los Angeles International (LAX) to Los Angeles.