My Husband is the Best One - S3-E14
Continuity mistake: In a different episode the Alan Brady show writers were on a different floor than Alan Brady and Mel Cooley. Yet in this episode they're on the same floor because we can hear Alan yelling at Mell while Rob is in the writers room where Sally and Buddy, currently furious reading the magazine article. (00:14:37)
The Lady and the Tiger and the Lawyer - S3-E16
Continuity mistake: Donna goes back to the den to get her coat to show Arthur. Laura yells at Rob in the kitchen "Rob! Did you lock her in the Bathroom!?" It's a den in most of the episodes... Turns out in this episode it turns into a bathroom with carpet on the floor. (Supposedly when Laura is yelling at Rob in the kitchen).
Continuity mistake: When Richie asks Laura and Rob "Is dinner ready?" the door behind him is closed. Laura tells Richie "Yes, it's ready." We get back to Richie as he yells and the door is cracked open. Then when we see the wide shot of Richie, Laura and Rob the door is closed again.
Continuity mistake: Laura's parents aren't the same parents she had in "What's In a Middle Name" - different names & completely different actors.
Honeymoons Are for the Lucky - S3-E22
Continuity mistake: In this episode and "Will You Two Be My Wife?" the captain's offices are completely different and the captains are also not the same.