Other mistake: In the cave we see Tom Hanks drawing an analemma without a precise timekeeper, which is needed to draw one. What he could have done is a meridian rect, which is build with the meridian time. The analemma is the differential chart between the solar time and civil time.
Continuity mistake: When Chuck first goes over and sees the cave, it changes the camera angle and the sunlight is significantly dimmer and more orange, indicating a sunset.
Trivia: Screenwriter William Broyles took survival courses and during that time a Wilson brand soccer ball washed up on shore - the inspiration for Wilson in the movie. The director Bob Zemeckis states in the feature voiceover that they changed it to a volley ball because "a soccer ball has all those black spots on it'.
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