At about the 41 minute mark when Harold is beating on Phillip his mic comes loose and flops around. When he takes his next swing the mic is back clipped to his lapel.
At 23:50 when Harold is calling Jean, her cell phone is shown ringing in the woods & the time is 10:03 pm, but it's still daylight.
When Jensen is beating up Kopus, the wide shot from an angle shows that his "punch" misses Kopus by at least a foot.