During the cold open, a vampire breaks the windshield of Gunn's truck with his fist. After Gunn and Fred get out of the truck to face the vampires on foot, the glass shows no signs of damage.
When Connor is huddled against the wall after Angel throws him, there is a roll of papers next to him. In some shots it's perfectly rolled very tight but in others it's loose and partially unrolled.
The blade that comes from behind Linwood's chair and decapitates him has a large oval cut out of the middle so that it will completely miss the neck.