Clive and Liv question the cast and crew of the Zombie High television series in episode 2x10 "Method Head".
Liv breaks into a police officer's car outside a cop bar in episode 2x08 "The Hurt Stalker".
Major gets on a bus to Portland to see his mother and her wife in episode 3x06 "Some Like It Hot Mess".
Major heads into Fillmore Graves for the memorial party for the two murdered mercenaries in episode 3x11 "Conspiracy Weary".
The police show one of their suspects footage of his graffitied car pulling into the parking lot outside the crime scene on the night of the murder in episode 4x01 "Are You Ready for Some Zombies?".
Johnny Frost shows a video of him harassing a coworker while live on air as part of a sexual harassment seminar at the police station in episode 4x06 "My Really Fair Lady".
Liv has a flashback of a Fillmore Gaves soldier yelling at the victim in episode 4x07 "Don't Hate the Player, Hate the Brain".
Several photos of Graham Moss at zombie hotspots appear on a zombie doxxing website in episode 5x04 "Dot Zom".
Liv has a vision of Jack Klein getting fired a year earlier after losing the sales contest in episode 5x08 "Death of a Car Salesman".
Candy picks up Frank Chisel's coat with the cure and then rides off on a motorcycle in episode 5x10 "Night and the Zombie City".
Scully talks to the doctor in charge of the clinic where both families went for their IVF in episode 1x11 "Eve".
Scully tells Mulder that they need to ditch all of their electronics so they cannot be tracked in episode 11x07 "Rm9sbG93ZXJz".
Officer Eggers identifies a local sexual predator while Scully talks to the Chief of Police in episode 11x08 "Familiar".