Continuity: The whole family goes to the opera to see "Carmen". They have balcony seats and the stage is to their left, yet later on you can see them looking to their right.
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Hank Azaria, voice for many of the characters on the Simpsons, said in an interview with Conan O'Brien that most of his voices were just bad celebrity impressions. Moe Syzlak is Al Pacino, Louie the cop is Sylvester Stalone, and Comic Book Guy is someone he went to college with who had a personality much like comic book guys. With other characters who Azaria doesn't do are also celebrity impressions. For example, Mayor Quimby is JFK. See more...
Movie Mistakes blog
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The Simpsons (1989) - 4 mistakes in "Bart the Genius"
Directed by Matt Groening, starring Dan Castellaneta, Hank Azaria, Harry Shearer, Julie Kavner, Kelsey Grammer, Nancy Cartwright, Phil Hartman, Yeardley Smith (add more)
Updates: 
Series 4
Bart the Genius (season 1, episode 2)
Continuity: When Bart is explained the answer RDRR, there is a shot of him. There is a blue background where the classroom should be.
Continuity: While Bart starts the I.Q. quiz and is reading it out loud, his teacher says "Shh. Visualize it Bart." While this happens if you look in the background you can see the alphabet line. It starts out Tt Uu Vv Ww, then Bart's teacher blocks out some, then you see the letter T again.
Factual error: When Bart is in the genius school, the teacher asks him if he knows what happens if he adds an acid to a base. He replies yes, adds them anyway and the lab explodes and a green goo comes out, turning Bart green. If you add an acid to a base, you just get salt and water.
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