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.
Spoiler (in more than one way): The plot requires a solar eclipse to last for two hours. In fact, totality never lasts more than slightly over 7 minutes and usually more like 4 minutes. Actual darkening is only slightly longer, maybe 15 minutes.
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.