During the first car chase immediately after the small red car pulls in front of Harry and Det. Foster the passenger-side door panel can be seen smashed in. This is before any contact between the two cars.
When Harry and Det. Foster are about to drive out of the tunnel two people can be seen in the crosswalk as well as a mail truck pulling into the street. In the next shot both the people and the truck are gone.
When Det. Foster interrogates Harry at the parlor's room, the cigarette pack and the ashtray over the table appears closer/far and disappears many times.
At the end of the foot pursuit at around 10:00, Foster draws her gun twice in about five seconds.
On the subway train the sound of the baby crying can be heard but the in the video the baby is clearly not crying.
Harry knows Francis's dog is female, and Francis says, "We call her Pooch," but then Harry says to Pooch, "What a good *boy* you are!"