At the start of the eclipse during the Mayor's speech, Buffy removes her graduation hat twice, once in the wide shot (her blond hair is visible among the heads), and again in the close-up with Willow.
Angel rips the door handle off Buffy's ICU Ward, as the doctor is question. In the following scene where Angel finds the mayor trying to suffocate Buffy, the door handle is still there, where it should be still broken off.
When Angel goes to use the pay-phone at the hospital, you can clearly see his reflection in it.
When Angel is fighting the vampires during the final battle, the stunt man's face is clearly visible for extended periods of time.
As Angel's group charges into the fight, stage lighting is clearly reflected on the ground.
At 13:11 minutes, the doctor looks directly into the camera after saying "I'll be right there".
It is odd that Joyce, Buffy's mother, is not shown attending Buffy's graduation ceremony.