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- Marge's birthday is inconsistent throughout the series, given in various episodes as "the same as Randy Quaid" (October 1), or some date in either February, March, or May, Julie Kavner's actual birthday is September 7th
- Homer's birthday is shown on his driver license in several episodes: It's consistently May 12, 1956, which he shares (month and day only) with Emilio Estevez. May 12 is also the date that Kyle Reese arrives in The Terminator (1984), and the filming date for the Whammy Burger scene in Falling Down (1993).
- Bart Simpson's birthday is stated in different episodes to be April 1. In Simpsorama (2014)(#26.6) Bart says it's February 23.
After Phil Hartman was murdered, the various characters he played, such as lawyer Lionel Hutz and actor Troy McClure, were retired, rather than re-cast. However, they continued to appear silently in crowd scenes. Season ten, episode three, "Bart the Mother" (September 27, 1998) was his final voice performance.
In season three, episode fourteen, "Lisa the Greek," Lisa, angry at Homer for tricking her into helping him gamble on football, makes a bet that if she loves him, the winner of the Super Bowl will be the Washington Redskins, and if she doesn't, the Buffalo Bills would come out on top (Washington won). Actually, when the show premiered just before the Super Bowl, those two teams were squaring off in Super Bowl XXVI, and Washington came out on top 37-24. Over the next three years, FOX made it a tradition to air the episode just before the Super Bowl, and change the dialogue, so that the teams would include whatever teams were playing that year. According to the DVD commentary, Lisa accurately picked the winning team every single year.
This is the longest running primetime comedy series, as well as the longest-running primetime animated series, in U.S. television history.
A television critic titled his article "Worst Episode Ever!" after watching a late 1990s episode, and criticized the show's writing. In the later seasons, there are many episodes in which the Comic Book Guy criticizes a character by saying "Worst episode ever!" and "Worst (action) ever!" in reference to the television critic's article.