Continuity mistake: When Glen Holland hears that John Lennon was killed, he is sitting at his piano and outside the window it is sunny and leaves are on the trees. As he walks home, it is overcast, snow is on the ground, and the leaves are off the trees. Since Lennon was killed in December of 1980, the latter "weather" would be correct.
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.
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."
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.
Vice Principal Wolters: Corvair?
Mr. Glenn Holland: Yeah.
Vice Principal Wolters: I take it you didn't read Ralph Nader's book.
Mr. Glenn Holland: Well, unless Ralph is willing to buy me a new car, I'm going to have to stick with this one until the wheels fall off.
Vice Principal Wolters: Well, you might not have to wait that long. Heh, heh. Have a nice day.
Vice Principal Wolters: I care about these kids just as much as you do. And if I'm forced to choose between Mozart and reading and writing and long division, I choose long division.
Glenn Holland: Well, I guess you can cut the arts as much as you want, Gene. Sooner or later, these kids aren't going to have anything to read or write about.
Question: Sometime during the film the show the passing of several years by showing images of what happened during these years. I think it is at the time of the Vietnam War. A song is played in the background. Does anybody know what the name of that song is and whom by?
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