In the end of the episode, Gus is forgotten by Shawn, Lassiter and O'Hara inside Wispy Sunny Pines, although, according to the scenes of them entering the building, they had to pass by him in order to get out.
At 38:16, when Lassiter and Shawn are searching for O'Hara in Sunny Pines, you can see Shawn's shadow on the wall to the left of Lassiter. The actor James Roday clearly appears to be waiting for his cue before appearing in frame.
In Henry's flashback of him grabbing Scary Sherry and pulling her out of the window, one of the windows is pulled closed. However, in the beginning after Shawn and Gus think she has jumped, both windows were wide open.
Lassiter's fortune cookie changes position in his hand between shots.
When about to enter Wispy Sunny Pines, O'Hara puts the phone in her bag and the bag on her shoulder, but after the camera shot shifts the bag is on her elbow.
When the lamp falls on the floor, there are sparks from the light bulb shattering. The power was out and there wouldn't have been any sparks as there was no power.
Bianca backwards would be pronounced differently.