This is a great episode from the third season, the first episode to focus on Mama Carlson (Carol Bruce) and flesh out her backstory, her personality, and her interactions with the series regulars. (The story requires her son, the one person whose relationship with her is a known quantity, to be absent for most of the episode, so the writers can figure out how the other characters interact with her.) The late Carol Bruce is really great in this episode and some of the ideas introduced here became the basis for later stories, especially her advances to Andy.
Unfortunately this is another one where the missing-in-syndications scenes had to be edited in from a low-quality tape, but, again, it's better than being without the scenes that were cut in syndication, like Jennifer's drunk scene. (You know this already, but the difference between Loni Anderson and other late '70s sex symbols like Suzanne Somers and Farrah Fawcett is that Anderson was actually extremely talented, especially at comedy.) If anyone has a better-quality version of this episode, please contact me and we can work out a trade.
Music includes "Rough Boys" by Pete Townshend, "Hungry Heart" by Bruce Springsteen, "Duke of Earl" by Gene Chandler and "Someone To Watch Over Me" sung by Bruce. (I'm not sure about the song that's playing just before that.)