When Sandy is throwing the jelly-filled pastries at the French fish, she nearly empties the tray. Two shots later, the tray is completely full again.
When Sandy re-enters the building, Master Udon says that she must pass the four floors of fear. However, as she enters we can see that there are only three other floors including the ground floor and she passes through only three challenges instead of the four Udon stated.
Udon says that Sandy must pass the four floors of fear to get to the top. Earlier they didn't have to do this.
After Sandy tells Spongebob that she is leaving the island the chair that she was sitting on next to Spongebob disappears.