Other mistake: During the scene where Phoenix is questioning the leader of the future society in his office, he says at least one word (hell) that he should have been fined for, and isn't. We see that there is a ticket printer in the room in a later scene, when Savage sets it off during his own confrontation. (01:06:50)
Other mistake: When Simon Phoenix kicks through the windshield of the police car during his first fight with the SAPD, the windshield easily breaks into several large segments, as opposed to spider-webbing like real windshields made from safety glass do. Glass that would completely shatter and collapse into the car from a simple kick would be completely unsafe and illogical for a society that's supposed to be more technologically advanced than ours.
Other mistake: When Spartan is talking to the old Zack Lamb, he says, "Shit, you were a damn good flier." When says "shit", the morality machine buzzes, but the red light doesn't come on until he says "damn," where it buzzes again.
Other mistake: When Huxley delivers the line "Let's blow this guy" a hair, fiber, or scratch is visible on the film at the bottom of the screen slightly right of center. The contaminant is visible again when Huxley delivers the line "Whatever" a few seconds later.
Other mistake: The Verbal Morality Code seems to be applied in an almost haphazard fashion. Several times throughout the movie, both Spartan and Phoenix swear, and do so near an area where they should be vocally reminded of breaking the code, in fact have been previously reminded, and in spite of them not moving from that location are not warned again in the face of repeated swearing.