Executive Meddling: Executives at CBS prevented O'Connor from filming a true series finale. O'Connor was reportedly so angry that he wouldn't work with the network for a decade afterwards.
McLeaned: Jean Stapleton left the series after the first season due to feeling she'd gone as far as she could go with her character. This led to Edith dying off-camera between seasons and was the premise for "Archie Alone". Unlike most examples of this trope, Norman Lear actually did this to give Edith a dignified end and apparently took the death of the character personally.
Transatlantic Equivalent: All in the Family started off as an adaptation of the British sitcom Till Death Us Do Part, but Archie Bunker's Place was a completely original continuation of Family. However, Death creator Johnny Speight thought a sequel program like Place was such a good idea that he developed one for his own show, In Sickness & In Health, which premiered in 1985 and ran intermittently until 1992. Several episodes of Sickness were adapted from Place, including their own version of "Archie Alone" that was written after actress Dandy Nichols, who played Else Garnett, died in 1986.
What Could Have Been: According to a 2001 E! True Hollywood Story special, if the show had continued for a fifth season, Mike would have returned for a cameo, and the show likely would have had (according to Carroll O'Connor) a proper series finale.