Mick Flagg obviously pulls his punches in several shots.
The appliance that is used to make Holly's mouth look swollen is visible several times as she speaks from her hospital bed. Look for putty or plastic above her teeth, between her gums and top lip.
Obvious stunt man when Mick jumps onto the police boat.
When Mick first slaps Holly, not only does he obviously never connect-the sound is off by a considerable amount of time.