When Stacy gives Joey the reports she wrote for him, she is holding one with a report cove with a red spine in her right hand, and a clear spine in her left hand. In one shot, they briefly switch hands.
At the party, when goody is dancing her gloves are on then off in different shots.
At the end, the good guys place the head of the bad girl in a large coffin and close it off. Seconds later the coffin is not closed off anymore.
When goody is at the club, her skirt reveals pantyhose style faux gartered stockings but when she goes home with the drummer from the band, she is wearing garter belt/suspenders and stockings.
Although Goody sounds like an old-fashioned first name from the 1800s, it was not. It was a title, akin to "miss" or "ma'am." It did not become a first name until the 1900s, long after this film's Goody was born.
Before leaving their apartment, Goody applies bright red lipstick. When they leave the apartment 5 seconds later, she now has on light pink lip gloss.
How would Stacey know her fangs are dingy when she can't see herself in a mirror and Goody couldn't have told her because she said she never thought about it and no one else knows she's a vampire, not enough to see her fangs anyway.
When Dr. Van Helsing and his assistant watch hidden camera footage from a vampire meeting, the images of the vampires is not caught on camera. Near the end DR. Van Helsing and his assistant watch footage from a hospital surveillance camera, where the strange behavior of a vampire is caught on camera.