* HollywoodPudgy: Brenda constantly refers to herself as fat, [[ReplacementFlatCharacter just like Rhoda used to]].
* MorePopularSpinoff: At least in Britain, where this proved to be more successful than the parent show.
* SeasonalRot: Starting with the third season, where Rhoda and Joe have an explosive argument that leads to a separation. By the end of the season, they've divorced (it's finalized at the start of season four.) While the writers felt this was a better direction for the Rhoda character, the viewers disagreed and the show never recovered.
* ShippingBedDeath: One of the rare examples where the audience was fine with a TheyDo scenario, but the writers weren't. Their solution to their problem ended up killing the show with a divorce plotline that consumed the entire third season in a failed attempt at a ReTool.