Trivia: Throughout the show, the number 47 appears many times. There are multiple room 47's (where Syd found the Circumference in season 1 and the room in her memories from season 3, among others.), there are 47 Rambaldi artifacts, and Page 47 of the Rambaldi manuscript was the page that had Sydney's picture on it. Also the pagers flash 47911 when they get called into the office.
Trivia: When Batman whispers something to Deadshot and Deadshot says he'll tell, Wonder Woman asks Superman what Batman said with Superman saying she doesn't want to know. In an interview, Kevin Conroy stated that what he whispered was, "I know where you live, Floyd."
Trivia: Lou Diamond Phillips made two appearances on the show, as Mark DeSalvo, the security chief where Victor Drazen is being held. Philips and star Kiefer Sutherland are known for having worked together in Young Guns and Young Guns 2.
Trivia: The name of Byers' father is Bertram. In The X Files episode, "The Unusual Suspects," Byers tells the police that his name is John Fitzgerald Byers, born on 11/22/63, and that before JFK's assassination, his parents were going to name him Bertram.
II (The Samurai called Jack) - S1-E2
Trivia: Some of the dogs working at the mine look like ones from "2 Stupid Dogs".