Corrected entry: Willow had a head trauma, and a big bandage on the front of her head. Problem with that is when the bookcase fell on her it never hit her head, far from it in fact. If she did injure her head the injury would be on the back of her head, from where she hit the floor.
Corrected entry: In the season two episode 'Halloween' only the people who got their costumes from Ethan's store are meant to change into what they are dressed as when the spell is cast. However, Xander changes, despite having told the girls in an earlier scene that he got his fatigues from an army surplus store - not from Ethan's
Corrected entry: In the episode 'Passion' Angelus destroys Jenny's computer before he kills her, hoping to get rid of the hard drive with his cure on it. Two episodes later in 'I Only Have Eyes For You' Willow tells Giles she found lesson plans on Jenny's hard drive. If the hard drive was destroyed with the computer she wouldn't have been able to retrieve lesson plans, but if it somehow survived the damage Willow would have found the curse when she looked through the files. Either way it's a mistake.Shay