When the judge is holding Michael at gunpoint, the angle of his gun changes drastically between shots.
When the Meth dealers hang up on the son, there is a blank dial tone - but there is no dial tone for cell phones.
When Parker is unscrewing the cover on the chute, in the shot just after Hall and Oates are mentioned, you can see the screw backing out but it's rotating clockwise - either the screw has a left-handed thread (unlikely) or the shot was reversed.
When Judge Roy makes his last negotiating attempt before discovering his briefcase is missing, Michael attempts to cock the hammer of his Beretta, but misses and has to do it again. The sound effect goes off on the first attempt with a small click when he finally succeeds on the second try.