Revealing mistake: When Peter is on the trampoline, instead of saying "Peter," Carol says, "Go get 'em, Chris!" and a few minutes later the same thing happens after Cindy has a turn alone, you can hear Greg say "Why don't you give it a try, Eve?" (00:18:10 - 00:19:50)
Revealing mistake: After Mr. Maxwell says that the local people refuse to work on the movie, Velma asks why. In her close up, her right pupil is horribly misshapen. Not round, but a wobbly, almost cloud like shape. (00:01:35)
The Stand-in - S1-E9
Revealing mistake: When Pufnstuf tries to reason with Witchiepoo, Witchiepoo hits him with a giant powder thing and shouts "Make up." When Pufnstuf falls over his head almost disconnects to his body.