Actually, if you watch the beginning closely, you can see that "Love Machine" is on both back roll-up windows. So the "Love Machine" that you see while he is cleaning the car is backwards, and when he rolls up the driver's side window, you can see both of the slogans!
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Although not in the movie, but the original car was supposed to say "La Bamba" (listen to the earlier albums) and the movie was actually shot with the original "La Bamba". They removed the window and replaced it with a "dummy" window with "Love Machine" painted on it. That was Cheech's real car and didn't want "La Bamba" scraped off. Hence the replacing of the window. Must be nice to be rich, huh?
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