First of all, the sets and atmosphere are great. An opening grave yard is truly beautiful and spooky. Perhaps the big-haired living dead women crawl their way out of the dirt with too much ease, but style is more important than being realistic. The Count appears to have no reason to be at the boarding school's halloween bash, but he is there, uninvited, clashing with the other guests. The fact that there is a costumed vampire at the party, leads to amusing tension and the viewer knows that the Count will be teaching these people a thing or two about real vampires as the movie continues.
Cameras are placed creatively throughout the film. One strangulation scene on a dock is shot from underwater with screaming whale sound effects. Shots in Yorga's mansion utilize quite a bit of framing through doorways. In fact doors are important to the film, the house is rigged with mechanical gates that open to reveal vampires (or close to trap intruders) numerous times. Also in the house, unexplained baby dolls, but they are creepy and so serve their purpose. Sound effects include whispering voices and laughter, perhaps not original, but fun.
You could look at this film as a mess, or you could have a good time watching it as I did. I don't need every phenomenon to make perfect sence or for all elements to be resolved. I like mysterious, bizarre, artistic horror.