- A lot of the camera positions in the movie are decided by the director rolling the dice.
- The Japanese text on the sign at the entrance to the Sea of Trees in the film was written by Ken Watanabe.
- Although the film is called "the Sea of Trees", it was actually shot in the woods of Boston.
- The humidity in the forest was so heavy that after the cast and crew finished filming for a day, their shoes and clothes were all wet. The two leading actors, Matthew McConaughey and Ken Watanabe, often walk through the forest in wet clothes late at night to return to the hotel to rest.
The Sea of Trees behind the scenes gags
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Takumi Nakamura: [a loud howling sound is heard throughout the forest and Arthur yells if anyone is there] There is no one.
Arthur Brennan: Then what was that?
Takumi Nakamura: Tamashii.
Arthur Brennan: What's tamashii?
Takumi Nakamura: Tamashii are spirits. They are souls wandering these woods, until it is their time. Things are not what they seem here.
Arthur Brennan: It was probably just an animal.
Takumi Nakamura: There are very few animals in Aokigahara.
Arthur Brennan: Well, then it was one of the few.
Takumi Nakamura: This place is what you call purgatory.
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Takumi Nakamura: There are answers for this in science?
Arthur Brennan: There are answers for everything in science.
Takumi Nakamura: But not in God?
Arthur Brennan: God is more our creation than we are his.