The Second Time Around - S3-E11
Factual error: Wally's car phone operates just fine - without the huge exterior antenna it would have required in 1969. (00:12:50)
Factual error: Mundy makes a phone call by wiring a radio speaker to the wall jack. Clever, but it wouldn't work. He might be able to hear dial tone, etc., but no one he called would be able to hear him without a microphone/sound pick-up, which the radio didn't have. (00:16:15)