Buffy looks up at the clock tower and it says the time is 12:40. She then runs a few metres and looks up again. The time is now 12:10.
We can see Buffy getting her food when she's the first in line, but when she turns away from the counter, all her plates are empty. In the next shot, the food is again on her tray.
When Buffy is talking to Angel about his charade with Faith, Angel's necklace jumps from being tucked inside Angel's shirt to lying over top of his shirt and back again.
Obvious stunt double for the villain during Buffy's final showdown.