Trivia: Walter Koenig's recurring Psi Corps character, Bester, was named in honor of science fiction writer Alfred Bester, who coined the term "psi cop" in one of his many novels about psychic manipulation.
Sins of the Fathers Chapter 9: Tombstone - S3-E9
Trivia: When Spider-Man saves Tombstone from falling into a bubbling vat he jokes about him coming out with "green hair." Clearly that's a joke referencing DC comics' Joker.
Behold the Negative Zone - S1-E12
Trivia: When Blastaar comes through the Negative Zone into the Earth dimension, Thing remarks that Blastaar makes him look like Brian Austin Green. Brian Austin Green was the voice of Human Torch for the first season of this show. (00:11:18)