Corrected entry: On the night of the Harvest, Cordelia says that she is going to the Bronze - its a Friday. Strangely enough, everyone seems to be back at school the next day - a Saturday. (00:18:20 - 00:42:50)
Corrected entry: The stake Xander uses to kill Jesse disappears immediately afterward. It's not in Xander's hand, but if it was buried in Jesse's chest it would have clattered to the ground as he turned to dust. (00:41:10)
Correction: If a stake in in a vampires chest & not touching another person then the stake also turns to dust (this has happened to various other vampires in the series).
Corrected entry: Cordelia tells Buffy there's no cover charge to get into the Bronze, but later that episode, right before the vampires attack the Bronze, the bouncer is taking money from people on their way in. (00:18:20 - 00:31:50)
Correction: The bouncer demands ID from the approaching vampire pack and gets upset when they don't show him any, but he didn't get any ID from Buffy or other patrons. It's possible that the bouncer has an understood relationship with underage clubgoers: pass over some cash instead of ID. Buffy would have learned about this earlier from Cordelia (after Cordelia insulted Willow but before Buffy went to speak to her).
Corrected entry: When Buffy is gathering supplies in her bedroom, we see all of the usual vampire fighting supplies, such as crosses, holy water, and stakes. In addition to these, she has a jar of communion wafers. What are these supposed to do against a vampire?
Correction: There is nothing in the school scene after the Harvest stating that it is the following day. It could be the Monday.