Throughout the scene in the sub station at the beginning of Act Two, there's a very active female extra in a pink and white top that appears walking back and forth outside the shop. You can first glimpse her hiding behind some foliage, waiting for her cue to walk past, just as the shot changes when Jerry starts to say, "As long as it doesn't involve Alex, there's nothing we can't solve" (watch the lower left corner of the window just as the shot changes). Then, as the injured Zeke is telling Justin about his problem, she can be seen through the shop's main doors walking back to the left - twice. Finally, after Zeke says, "I'll catch you at rehearsal," as he's about to leave, she walks by the window again, this time going back to the right. If you pay attention to everything that's going on outside of the shop throughout the entire scene, her presence becomes quite obvious.
The "sky" behind the fairy talent agent is obviously a wall with clouds painted on it. The seam in the wall is clearly visible in many of the shots.