In the shot from the door into the apartment with April on the floor after one of the thugs knocks her down onto the floor and she says "off all the nerve of those creeps," the dead bolt on the door is missing. Then when the turtles return her stolen things, the dead bolt is back on the door.
When the security guards arrive at April's apartment, the doorknob and the dead bolt are on the right side of the door. Then when Rex attempts to answer the door, the knob and dead bolt are on the left side of the door. Then in the shot of the door being blown open by Rex's gun, the knob is on the right side again and the dead bolt is gone. And when Rex is carrying April out of her apartment, the knob and dead bolt are missing from the door.
When on the bridge the turtles get surrounded by robots. A robot blasts a hole in the bridge and the turtles drive the turtle van into the river below, but in the next few shots we see that April, Rex-1, and Splinter are driving it through the city. However, it could be possible that Donatello built a spare.
In the shot of Irma and April standing in the doorway to April's apartment and they discover that her apartment is being robbed, the front door is missing.
When the turtles are surrounded by the robots on the bridge Donatello says "they outnumber us 3 to 1"