When Zimmer is picking away at the wall of the school to place his bomb, he opens a good-sized hole, but when there is a cut to a closeup, the hole is just starting.
When Frank Harper (Rory Calhoun) is driving in the opening scenes, camera views of him from in front of the car through the windshield show the car to have no rearview mirror. Later, the scene shifts showing the driver from the rear, and the rearview mirror has appeared with Calhoun's face clearly visible in it.
Removing the rear-view mirror is a filming technique; it is not considered a Goof.
Removing the rear-view mirror is a filming technique; it is not considered a Goof.
Any time there are cars shown, there always are car horns honking in the background; this is especially evident later in the movie.