At the beginning of the film when Charley is running, he jumps over a couple making out and suddenly jumps over the bushes as well.
At the end, when Bozworth (Brian Thompson) gets killed by getting his belly ripped by Belle's (Russel Klark) fingernails, you can clearly see that he's a dummy.
Vampires cast no reflection and therefore are invisible in mirrors. TV video cameras use mirrors. Regine's vampire performance on Fright Night should not have been viewable on TV.