When Alex, Maggie, and Dana are listening to a guest lecturer on near-death experiences the author's name is Thor MacLeod. Thor was one the Asgard characters Michael Shanks did voice-over work for in the series Stargate SG-1 (1997).
Michael Shanks asks if the patient tried to Trepanned himself (drilled into his head). In the Stargate SG1 episode Demons his character, Daniel Jackson, identified and explained the trepanning ritual to the team.
Currie Graham played James Marrick in Stargate: The Ark of Truth (2008) with Michael Shanks who played Dr. Daniel Jackson.