Other mistake: When Arnie enters the plane's cargo hold at the start of the film, he is confronted with a black dog in a cage barking at him. As he slides past the dog it seems to pay no attention to Arnie, but seems to be more interested in barking at someone else who is out of shot. Trainer perhaps?
Other mistake: At the mall when Sully first sees Matrix, he grabs at Cindy's handbag wanting a quarter. It's amazing that Cindy first would have a quarter just laying around in there, but it's also amazing how quick he finds it without looking! What if he got to the phone and it was a nickel? He never even looks at it!