Continuity mistake: When Allison arrives at the island in his raft, he sticks out his head to take a look. When his face is seen, his hair is completely dry, but when his back is seen as he prepares to go ashore, his hair is soaked.
Continuity mistake: In the first few scenes in the lobby of the Contention City Hotel, the clock is silent. In later scenes, it is ticking quite loudly.