- Acting for Two: Richard Dean Anderson, Amanda Tapping and Christopher Judge play the normal versions of Jack, Sam and Teal'c and their robot duplicates.
- Directed by Cast Member: Directed by Michael Shanks, which is why his duplicate is killed off early on the episode, to give him less to do as an actor.
http://tvtropes.org/pmwiki/pmwiki.php/Trivia/StargateSG1S4E21DoubleJeopardy
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