When Shredder is watching the fight of Lotus and Leonardo on TV at the motel, the manager shuts off the TV and Shredder breaks the chair in half near the manager and the TV. Then in the next shot when the manager turns the TV back on, the chair is standing back up.
When the turtles are on their way to Aqualand, they are driving on the left side of the road and oncoming traffic is on the right side of the road. Since the story takes place in New York City and not Japan, they should be on the opposite side of the road.