These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
More Popular Spin-off: At least in Britain, where this proved to be more successful than the parent show.
Seasonal Rot: 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.
Shipping Bed Death: One of the rare examples where the audience was fine with a They Do 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 Re Tool.