In this episode, we discover that Ray Haffner suffers from arachnophobia, which is the abnormal fear of spiders.
We also discover that Red John has a tattoo with three dots on his left arm.
According to Jason Cooper, Bret Stiles appears to be missing.
When Patrick tells Lisbon what Kira Tinsley told him, he says "that's my leverage". Curiously, Beth Riesgraf, who played Kira Tinsley in the episode, is best known for her portrayal of Parker on the TNT television series Leverage.