Near the end Brett is pointing the gun at Avery, when he walks away Brett puts the gun on the table in front of him and sits on the couch, in the next shot up close Brett has the gun in his hand again.
When Heckle and Jekyll are making the deal with the mystery person, the big balloon in the background says on it "Mountasia Family Fun Center" which is in Valencia /Santa Clarita California, not New York.
The goof item below may give away important plot points.
During Charlie's abduction scene in the tunnel, the Mercedes has a correct New York license plate. After the impact with the guard rail and near miss with the truck the front plate has changed to a yellow on blue California plate.