As this episode begins straight after the previous, Angel is now behind Spike in the opening scene, forming a major continuity flaw.
Although subtle movements by at least three of the dead bodies in Hainsley's showroom could be written off to the way they were mounted, or being buffeted by air currents, the illusion is somewhat spoiled when his manservant enters the room and the corpse closest to Angel quite clearly blinks.
You could tell a large amount of Spike's lines were looped, as his mouth sometimes doesn't fit what he's saying.
Spike has ghost-like qualities (running through Angel, walking through walls, desks, etc., being unable to punch because his fist goes right through) but is able to sit in Angel's chair with his feet on Angel's desk, and is also able to sit in Angel's car. He should just go right through these objects.