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Homer's trademark expression is the frustrated "D'oh!" When Matt Groening asked Dan Castellaneta to create an "annoyed grunt" for Homer, the only thing Dan could think of was "D'ooohh...", from James Finlayson of the Stan Laurel and Oliver Hardy films; Finlayson may have created that as a euphemism for the then-forbidden "damn". But Groening thought Finlayson's term took too long to say for the episode time budget, so Castellaneta shortened it drastically. Homer's annoyed grunt (Do'h!) has grown popular since the catchphrase's appearance. After a few seasons, "D'oh!" became firmly set in the American popular lexicon, and the term was accepted for the online version of The Oxford Dictionary. The French version of the television show translated "D'oh" into "T'oh." The Spanish version of the television show translated "D'oh" into "Ouch!" In one episode, Maggie is seen playing with a modelling compound similar to Play-Doh. The label of the compound's container reads "Play- (Annoyed Grunt)". Homer's famous catchphrase "D'oh" is written as "annoyed grunt" in scripts, meaning Maggie's modelling compound is in fact Play-D'oh. Homer's annoyed grunt, "D'oh!", has been added to the Oxford English Dictionary, considered to be the ultimate authority on the English language. In the scripts, Homer's "D'oh" is written as "(ANNOYED GRUNT)", Marge's disapproving murmur is written as "(FRUSTRATED MURMUR)", and Professor Frink's mumblings are written as "(FRINK NOISE)".
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.