On Cheers it was established that Frasier’s father was a dead scientist, and his mother was a domineering meddler (played by Nancy Marchand) who tried to murder Diane because she thought Diane wasn’t good enough for her son.
That continuity was scrapped when Frasier was spun off into his own sitcom. Now it was his mother who was dead, and Frasier’s dad was a living retired police detective. Frasier and Niles’s dead mother was depicted in old home movies in one episode, played by Rita Wilson.
No big deal; both shows worked so I wasn’t bothered by the changed continuity.
On this week’s season premiere they attempted to reconcile the two; Frasier had an extended “imagination” sequence where he was in a room with all the women he’d loved, including Shelly Long as Diane and Rita Wilson as Frasier’s mother. Diane mentioned Frasier’s mother had tried to kill her.
I’ve missed whole seasons of Frasier; have they done any more of this retconning?