Revealing mistake: Anytime the camera is on Richard Dreyfuss' hands while he's playing the piano, it is clear that he is not actually playing; his hands are frequently in the wrong part of the keyboard for the sound being produced. At other times, when his hands are moving down the keyboard, the pitch we hear is going up, or vice-versa.
Mr. Glenn Holland: Let me ask you a question. When you look in the mirror, what do you like best about yourself?
Gertrude Lang: My hair.
Mr. Glenn Holland: Why?
Gertrude Lang: Well, my father always says that it reminds him of the sunset.
Mr. Glenn Holland: Play the sunset. Close your eyes. One, two, three, four.
Trivia: All the American Sign Language used in the movie is accurate. When Iris tells Cole to open the window, Cole's response is not translated and she says "don't bust my butt." What he signed was, "Tell him to open the window himself."
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