The graduation robe Principal Wexler wears in the opening scene has three stripes on the sleeves and two vertical stripes down the front, the symbol someone with a doctorate wears at a graduation ceremony. The principal does not have a doctorate.
When Ren and Louis are fighting to get in the royal bedroom, Louis knocks off Ren's pineapple hat. In the next shot, the pineapple hat is still on her head.
After waking up in the dirt, Louis puts his arm in a hole in his shirt. In the next shot, his arm is in his sleeve, and then back to the hole.
While Ren is in the forest and almost gets bitten by the snake, you can see by looking through the spaces in the trees that it is light. When they emerge from the forest immediately afterwards, it is dark.
When Tawny reaches shore you can see the raft near the coastline about to be pulled out to sea, but when she appears under the palm tree the raft is safely on shore.
When Ren and Louis are fighting about the perfect room with a view, you can see a fan atop the screen. This was after Myles said there was no electronics on the island.
When Tawny and Twitty try to find a boat to the island, they go to a "nearby" marina and ocean. They are in Sacramento, California and therefore would be in a valley.
As Eileen steps out of the plane and is carried away by the islanders, a microphone can be seen on top of the screen.
At Graduation, Ren says parts of her speech twice.