Mulder tells Scully she has "manos de piedra," which translates to "stone hands" in English.
Jay Acovone previously played a recurring character in Stargate SG-1 (1997). Mitch Pileggi later played a recurring character in Stargate SG-1.
When Agent Doggett is cleaning his gun, he's watching a NASCAR race on TV. When he greets Mulder at the door he says, "You're the last person I'd expect to see knocking on my door on a Saturday morning." NASCAR races are run on Sunday afternoons and Saturday nights.