Butch Cassidy and the Sundance Kid is a Tau'ri movie. In one pivotal scene towards the end, Sundance said, "For a moment there, I thought we were in trouble" before they faced the Bolivian army and were killed. Dr. Jay Felger, Colonel Samantha Carter, Dr. Rodney McKay, Dr. Nicholas Rush and Colonel Everett Young had all seen the movie. Both Rush and Young counted it among their favourite films.
In 2002, when Teal'c was trapped inside the Stargate, Harold Maybourne confronted Colonel Jack O'Neill. After their brief conversation, Maybourne states that he checked into the Accent Inn under the name "Cassidy". O'Neill asked if he meant David or Shaun to which Maybourne responded with Butch. (SG1: "48 Hours")
In 2003, Dr. Jay Felger worked with Major Samantha Carter on one of Ba'al's outposts to rid the Avenger virus that disabled the Stargate Network. Felger thought that him working with Carter was analogous to Butch working with Sundance, though Carter noted that both were ultimately killed. (SG1: "Avenger 2.0")
In 2007, after Lt. Colonel John Sheppard destroyed a room containing Bug People, McKay quotes the film: "Think ya used enough dynamite there, Butch?" This references the Sundance Kid's line after Cassidy uses too much dynamite to blow a safe, destroying a train car in the process. (SGA: "Vengeance")
In an alternate timeline in 2009, Dr. Nicholas Rush quoted the film: "For a moment there, I thought we were in trouble." He says this to the alternate Eli Wallace moments before stepping into an unstable wormhole and dying. Eli, who was recording the scene on a Kino, had no idea what Rush was talking about, implying that he had not seen the movie. (SGU: "Time")