I feel that they don't actually care about the believably of it anymore. She just decks out the stage with dry ice and a projector. Don't forget that she's powering everything with a generator or a battery as well.
Yeah, this episode was a major step backward for this series.
The only part of the episode I truly enjoyed was the repeated gag of her being grabbed on the shoulder by a series of creepers, including the clingly noble woman she tried to scam earlier.