One Day at a Time

In the 1979-1980 season, Mackenzie Phillips was dealing with drug addiction. When she entered rehab in 1980, her character, Julie, married Max and moved to Houston. In the seventh season (1981-1982), Phillips returned as a guest for a two-part episode in which Julie and Max deal with marital problems. In the ninth and final season (1983-1984), Phillips collapsed on-set. Producer Patricia Fass Palmer asked Phillips for a urine test. Phillips told Palmer not to bother. Phillips was quietly fired, and Julie was permanently written out of the show.

It's clear that the external shot of the the building where Ann Romano and her daughters live does not match up with interior set used during the series. The Spanish style windows do not match up with the windows shown inside the apartment, for example.