When Spike is testing out the Buffybot, and she halfheartedly tries to stake him, he grabs her. In the first camera angle, where Spike and the Buffybot are facing the camera, the Buffybot's hair is under Spike's arms. In the second angle, her hair is over his arms.
When Spike is laying in the elevator during the fight his legs change position. At one point the Buffy robot is standing in front of the elevator but then isn't.
Obvious stunt double when Buffy bot throws Spike on to a table.
Spike is standing in front of Glory with his hands tied behind his back when Glory hits him his arms fly out to the sides but when he hits the wall his hands are tied behind his back again.
When Buffy is following the cougar in the desert, in a long shot are visible the legs of someone of the crew striding in the higher right side of the screen.
Just before Buffy says, "Hello Kitty," in the desert, a blue shirt sleeve is briefly visible on the right-hand side of the screen.
There are many times in Glory's apartment where Spike or part of him is exposed to direct sunlight but he seems unaffected.
Around 38:35 during the fight scene with Glory's Minions Zander is engaging with a Minion about a foot shorter than him and the next shot you see Zander shorter than the Minion. It appears that the "Zander" stand-in was not as tall as Zander.