The trees have arms and faces, and the key may be in the tree's mouth. When a "temple spirit" resides in one of the trees and a player reaches in, the tree will grab the player and say "Oh, Yeeeaaaahh!" or "Got you!". Those two lines were provided by Dee Bradley Baker, who voices Olmec.
- The Dark Forest trees are similar to the apple trees in The Wizard of Oz.
- In the first 13 episodes of Season 2, Olmec did not warn the players about the temple spirit in the Dark Forest while he guides them to the temple. From The Electrified Key of Benjamin Franklin onward, he does.
- In some episodes like The Bone Necklace of the Blackfeet Chief, a tree will be seen hanging one of its arms on the breakable wall showing a sign that the temple spirit is inhabiting it. In some episodes, one of the trees catches the contestants with only one arm.
- In The Useless Map of the Chibcha Chieftain, just before the first commercial break, one of the trees was moving its arms even though the artifact was located in its location and all three temple guard were encountered in different locations. This was presumably done for comical purposes.