Revealing mistake: When Millbarge changes the missile's programming at the last instant, the rocket changes course simply by rotating the shooting frame - and even if it could change course like that, the angle of ascension would be wider than indicated on the bunker base's computer screen.
Continuity mistake: After the grenade sets off the box of grenades, and the subsequent explosions demolish the building, Millbarge says "I'll get the horse." Trouble is, throughout all of the gunfire and the explosions, there is no sign of the horse; it would have run off somewhere. When he gets the horse, it's tied up right next to the now demolished building. It would have been killed by the gunfire and/or the explosions.
Trivia: Another notable cameo appearance is made by the special effects legend Ray Harryhausen in the role of Dr. Marston.
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