The Summers house address is incorrectly shown on the curb as 1313.
As Spike is leaving the house at 23:19, you can see his reflection in the mirror to the right of the front door, as well as in the glass of the door's sidelight.
The edge of the prosthetic of the cut on Buffybot's face can be easily seen.
Willow can be seen putting down what she used to make the fawn come to her.
In the beginning when the gang is hunting the heavyset vampire, the camera pushes in to Willow on top of a mausoleum, and as it does you can clearly see a pair of camera flags being moved along with it on the right of the screen.
The Scooby gang is trying to convince the town that Buffy is still alive by using the Buffybot. They assume if people find out that Buffy is dead, Dawn will be taken away. However, in the season 5 finale, a giant tombstone with Buffy's name on it was shown in the cemetery. The shot of the tombstone is also shown during the 'Previously on Buffy' montage. Having a giant tombstone erected is not conducive to pretending Buffy is alive.