Despite having full thickness burns over his entire body, Dracula's clothes are virtually untouched at the beginning of the movie.
The net that has been thrown onto Dracula when he's in the pool repeatedly moves up and down.
Luke throws a knotted rope on Dracula, which then disappears and reappears between shots.
When Dracula's charred body is lowered into the bathtub of blood, he's barefoot. He's shown wearing shoes when he wakes up and attacks the students, and when he is chained up in the pool.