Other mistake: When the Mafia are having a dinner party, the film cuts to Charlie Croker throwing his bicycle into the substation to cause a powercut. After the big explosion, the camera switches back to the dinner party and then all the lights go out. But before the lights go out, if you look at the end of the dinner table, there is a doorway, and you can see smoke coming from the candles which have already been lit before the lights go out. Within seconds of the power cut, these candles are brought in from doorway and another set comes in from the left-hand side. A little premature.
Other mistake: The narrator says that the train stopped to let the train filled with Christmas carolers go by, but the train passed after the train had already crossed the tracks, so there was no need to wait. (00:19:30)
Other mistake: A group of students poses as painters so they can investigate shady doings at A.J. Arno's home. They had made a work order which included their dormitory's phone number. When Arno calls the number, he asks, "Is this 247-8824?" A student says "Yes" but the number on the phone dial is "471249624."