Continuity mistake: There is a scene at an airport where Mel Brooks is approached by a man claiming to be a FBI agent or something like that. In the next shot inside the bathroom you can see the boom microphone from the top of the screen. (00:04:05)
Continuity mistake: When Brophy tries to remove the large rock that smashed through Thorndike's bathroom window, the toilet tank lid behind him is askew. As Brophy and Thorndike leave the bathroom, the toilet tank lid is properly seated on the tank.
Continuity mistake: As the Killer tries to strangle Thorndike in the telephone booth, there is an up close reflection of his face in the metal faceplate of the pay phone, yet all the scenes show the Killer about two feet away from the telephone faceplate.
Continuity mistake: When Thorndike is running to the park's storage shed to escape the pigeons dive-bombing, the back of his jacket has a set number of prominent pigeon dropping marks, yet when he enters the shed there are more markings seen, and all are smeared across the jacket.
Continuity mistake: The tissue paper in Professor Lilloman's right hand instantly jumps to his left as he gets up out of the chair in Dr. Thorndyke's office.
Continuity mistake: In Dr. Thorndyke's office, Dr. Montague holds a pencil in both hands in the front view of him, but the view over his right shoulder shows him holding the pencil in his right hand.
Continuity mistake: After stabbing Thorndyke in the shower with the newspaper, Dennis drops it behind and to his left. The next shot and the newspaper is seen inside the shower tub, close to the drain as the ink runs off the paper into the drain.
Continuity mistake: The piano player speaks into a microphone in the close up, but disappears in the long shot of him.
Continuity mistake: Madeline Kahn and Mel Brooks are in a hotel room in San Francisco. She is smoking a cigarette which grows shorter as the scene progresses. After cutting away and then back to her, the cigarette is long again. (00:49:55)
Continuity mistake: Dennis, Thorndyke, and Brophy are shown in the close up getting up together outside the elevator, but the long shot shows Dennis already standing three to four feet behind Thorndyke and Brophy as those two stand up.
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: Brophy and Dr. Thorndyke are in the bathroom. The lid of the toilet is ajar, then is suddenly closed properly.
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.
Answer: It was a song written by Mel Brooks for the film. It's called "If You Love Me Baby, Tell Me Loud."
Bishop73