Is this REALLY a goof?

Rating: Null/10 (23 September 2011)

Continuity: When Scott leaps up and goes to attack Todd across the table, and Todd holds him back with waves of energy, the girl drummer from TCAD is first leaning against the wall, disappears from the frame, and then reappears when the scene shifts.
Did anyone actually confirm this as being a goof? I got the impression the wave effect was as sort of 3-D mirage effect that was supposed to be like 3D concentric circles that obscure your line of vision. Kind of like the singularity of a black hole kind of thingy. The background was fading to black so this all comes across as intentional to me to show off the cool perceptual effects of Vegan Power. The girl in the background reappears as soon as Evil X number 3 throws Scott through the wall. I realize nitpickers are going to pick, but this movie likes the play with reality a LOT and I think the director and the effects guy deserves the benefit of the doubt on this one.