Continuity mistake: When Xander is showing Willow and Buffy his fake ID and the view of the shot is from behind Xander, he is holding the card with his thumb and middle finger. Switch to the view from behind Willow and it's being held with his thumb and index finger. Then it switches to behind Xander again and it's back to thumb and middle finger.
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Continuity mistake: When the Cavemen knock out Willow, she lands flat on her front. Later on, one of the Cavemen watches Willow as she lies unconscious, and she is now lying on her back. Then when Buffy finds her when the building is burning down, she is back on her front.