When Russell gives Tommy the videos the doors to the room open out, but later when Peanut is followed by Monica and is let in the room with Tommy, the doors open in.
Near the end of the film, Frank prepares to stab Monica but shoves the knife into the ceiling, releasing a pile of white asbestos dust all over himself. A moment later he falls from the balcony but when we see him on the ground, there is no powder on him at all. Then a close up shot shows him spitting powder from his mouth, and there is some on his head.
Nathan tears up his basketball game tickets, then later they are intact.
Tommy is tied to the post with Monica at floor level and says "nice cutlery" when Frank opens the bag with the knives on the bar. There is no way Tommy could have seen them AND when Frank is between the knives and Tommy.
Frank's rubber gloves appear and disappear.
In LA County courts the defendant is always in regular clothes and not visibly restrained in front of a sitting jury.
When Tom is in the jail cell with Carl, Tom calls Carl "CBW", but his full name is Carl Wayne Bishop (CWB).