Continuity mistake: When the doctors are trying to save the patient from being killed, Mel Brooks runs up a long flight of steps in the clock tower. But, during his climb, he saw that there was a step which was cracked, so he avoided it by jumping over it. When he landed on the step above it, he fell through. While he was dangling from a step, you can see that the one that he jumped over is no longer cracked. (01:27:10)
Continuity mistake: The opening scene shows the exterior of a 747, which has 2 large windshields meeting at a center post. The cockpit interior shot shows an arrangement of 3 windows, with a smaller window across the middle instead of a center post.