When Angel visits Buffy to reveal what he knows about Billy Fordham, after entering the kitchen, he leaves the door open a few inches and then stands at the counter opposite Buffy. In the next shot, Buffy and Angel walk out of the kitchen and the door is closed completely.
When Buffy takes Drusilla hostage and Spike tells everybody to stop, the girl Spike was biting has no visible wound from being bitten, despite her hair being completely out of the way and not obstructing the view of her neck and shoulder area where Spike was biting her. There should have been some blood coming from the wound, since she wasn't completely exsanguinated. In fact, she even had enough blood left to maintain consciousness and stay on her feet after Spike let go of her.