Continuity mistake: When Maggie does her disappearing act through the sinkhole, and Marge rushes to get Homer, the wooden porch swing is directly in front of the window, with its top beam as high as the top of the window. When Homer says, "This dome can play tricks on you," note the door and window behind Marge, because the swing is now gone.
Trivia: As inspiration for the crowd scene in the film, the production staff spent a long time looking at the Simpsons poster that features over 320 of the show's characters. Groening said that they did try to put every single character into the film, with 98 having speaking parts.
Homer Simpson: Marge, in every marriage you get one chance to say, "I need you to do this with me." And there's only one answer when somebody says that.
Marge Simpson: OK Homie, I'm with ya.
Homer: Thank you my sweetheart.
Bart Simpson: Mom?
Marge: Yes honey?
Bart: You just bought another load of crap from the world's fattest fertiliser salesman!