One of my favorite behind-the-scenes stories about Seinfeld is that co-creator Larry David requested reshoots of the Season 4 episode “The Handicap Spot” after Frank Costanza was recast with Jerry Stiller (RIP) in Season 5, as David was concerned about confusion when the episode played in syndication (similarly, he had Wayne Knight re-record the Newman dialogue in Season 2’s “The Revenge,” as David himself originally performed the voice-only role in the episode).
But to the show’s credit, there are multiple other examples where its history demonstrates a smart attention to detail.