When Jessie (Cindy's mom) is speaking with Amy, there is a loose strand of hair across her forehead that appears and disappears between shots.
Marcus is hesitant about un-jamming the box crusher as he fears Garrett will turn it on while he is reaching inside. That type of box crusher has a safety gate that must be completely lowered over the opening or it won't operate. There would be no way for the crusher to turn on if the gate was obstructed by a person's body part reaching in.