When Bolton knock out Cargan with a two-by-four looking object; he drops the object near the unconscious Cargan. But on the next immediate cut when Magee sneaks up from behind and picks it up; the object is now at a different location away from Cargan.
When Bolton sneaks up behind Cargan and knocks him out; the action happens on a mound of snow away from the stairs. But on the next cut when Bolton searches him; they are now near the stairs.
When Magee escapes with the money through a hidden compartment in the house; he goes to Mary's room and knocks a few times on her door. However, there is no audio heard of him knocking on the door.