Corrected entry: In the final scene in the chemical factory, Brian takes a fire extinguisher and breaks the "head" off and throws it into the blaze thus causing the fire to blow itself out. This is impossible.. With the pressure of the extinguisher if he were to break the head off it would either blow up right then or send him flying from the pressure about 50 yards.
Corrected entry: When Brian visits Stephen in his boat, they sit and talk. On the river behind them, you see a slow boat passing by, but from the camera-angle from the shot before up the river you can't see a boat at all.
Correction: The boat was slowly moving into the shot.
Correction: Actually, this was proven wrong by the Mythbusters. They proved you can do this without being thrown or an explosion. The extinguisher would not explode because there is pressure being released from it while he's holding it.