You know that thing where you watch a new-to-you B-movie and think “Wait … isn’t this pretty much just [insert other B-movie title here] with a different name?” It might be a remake of some sort, like Cat Women of the Moon —> Missile to the Moon, or maybe something from the Robert L. Lippert method of shooting half a dozen movies at the same time with the same sets & actors, or maybe it’s just a combination of laziness and plagiarism.
The one that comes to mind right off the bat for me are two titles done by RiffTrax: Grizzly and Day of the Animals. Except for the fact that one has Leslie Nielsen feasting on the scenery and one doesn’t, I can’t keep them straight … I’m pretty sure each was made from the other’s 2nd unit footage.
Do you have any favorite examples of this?