Courtenay J. Stevens, who plays the leader Keras, also played Lieutenant Elliot in three episodes of Stargate SG-1 (1997).
This episode has the same title as the science fiction novel "Childhood's End" by Arthur C. Clarke. The theme of the novel is an assisted evolution of man into non-corporeal beings.
The face-paint on one of the children is nearly identical to the face-paint of 80s professional wrestler Ultimate Warrior.