If there is one thing the horror movie industry loves nothing more, it's pumping out a long line of sequels that get progressively worse the longer a franchise clings on.
Because horror films tend to have that perfect combination of being the cheapest and simplest films to write, shoot and produce, their return on investment tends to be through the roof in comparison to other releases in other genres. Plus, horror might be the only genre in entertainment where a poor critical response to a film doesn't mean a planned sequel isn't immediately scrapped.
Just look at the Leprechaun franchise.
However, with a genre that is so happy pumping out the sequels in a way no other does, there's always going to be a certain amount of crossover and repetition in the films. From rehashing the same ideas and strategies, shooting the same sequences again and again, to literally dropping in the same items and objects from previous films and hoping nobody notices, there's no end to the ways in which horror writers will try to just get their releases over the line.