The truck transporting the chlorosulfonic acid has a warning sticker with the number 1203 in the back. That is the warning sticker for gasoline/fuel oil. the correct warning sticker for chlorosulfonic acid is 1754.
When Michelangelo throws a water balloon at Donatello, it's yellow, but when it hits Donatello it's blue.
April is tied up and gagged with duct tape during the chase scene. When she gets out of the van later, her hands are still tied, but her mouth is uncovered.