Audio problem: In the scene where Chuck is throwing coconuts at the rock, the sound of the coconut hitting the rock comes after the coconut actually hits it.
Cast Away (2000)
1 audio problem - chronological order
Directed by: Robert Zemeckis
Starring: Tom Hanks, Helen Hunt, Lari White, Paul Sanchez
Continuity mistake: Chuck is on the plane going back home with a noticeable sun tan on his face. When he is talking with the dentist he is way paler, only to be slightly darker during the welcome party thrown hours later.
Chuck Noland: You wouldn't have a match by any chance would you?
Trivia: When the shots on the island were finished, the sound had to be completely redone, as the surf was too loud.
Answer: Cast Away was filmed on an island called Monuriki. It's part of a group of islands called the Mamanuca Islands, in Fiji.