On Semi trailers with two rear doors, each rear door is secured separately. After a firefight, Zib is shown jumping on the back of the Semi and opening and entering only the right hand facing rear door. But seconds later, both doors are shown to be open.
The opening scene is set in the 1700s, but the little demon born of the woman is captured in a modern plastic container.
At about 8 minutes in, when the two guys are looking for the sister of the monster, they first kick in a Men's Room door (she's not in there) and then the Ladies' Room door - as the camera switches to their POV to scan the Ladies' Room, notice the URINAL on the wall.