The Great Voice Robbery - S1-E3
Audio problem: Several times throughout the episode while the characters are speaking in other people's voices the spoken words don't match the lip movements.
The Bugaloos (1970)
1 audio problem in season 1 - chronological order
Starring: John McIndoe, John Philpott, Wayne Laryea
Revealing mistake: Woofer and Tweeter were often seen hanging off the back of Benita's car. From the way the front of their costumes are flattened out you can tell they were lying on a flat surface to get the effect of them flying.
Firefly, Light My Fire - S1-E1
IQ: How do you expect to carry out your duties as a firefly? You'd look pretty silly walking around at night.
Sparky: Oh, I never go out at night, I'm afraid of the dark!
Lady, You Don't Look Eighty - S1-E13
Trivia: Caroline Ellis (Joy) references her actual birthday of October 12 when she complains the boys forgot it.