Malloy crawls through the open space at the scene of the 459 (burglary) and gets some sheetrock residue on the back of his shirt. After the camera changes angles during the next shot, his shirt is clean.
When the girl runs out the back door from the burglary, there is a line of storage racks to the right of the door on the inside. When Malloy and the other burglar exit the same door seen from the outside, the door is within a foot of a corner on that side.
Karen Black's character Susan Decker tells Malloy that her age is 23. In fact Black was closer to 29. Karen Black may have been almost 29 years of age but the character she was portraying was 23. That is not an error, factual or otherwise. Actors and actresses often portray characters who are either older or younger than they are in real life. That's a part of what acting is. Additionally the characters age was never mentioned.