Guest stars

Actor Jeffrey Dean Morgan portrayed dual roles for the episode. He returned as Winchester patriarch John, and was also the first to play the on-screen physical manifestation of the demon Azazel—the character had been only depicted in silhouette. Morgan was given free rein over the latter's traits, only being directed to "be different from John". He changed his voice and modeled Azazel's speech pattern after Jack Nicholson's scenes in The Shining in which he "gets all freaky".^[1] This "Nicholson-esque quality" continues in later depictions of the demon.^[2]

Hunter and Winchester-ally Bobby Singer makes his debut, and is played by Jim Beaver. Beaver had worked with executive producer Robert Singer on the television series Reasonable Doubts, and Singer gave him the part without viewing his audition tape.^[3] The episode also features the final appearance of the demonically-possessed Meg Masters as played by Nicki Aycox. Director Kim Manners was sorry to see her go, as he felt Meg had the potential to become a "great nemesis" for the Winchesters.^[4]

Writing

The staff struggled throughout the writing process to decide which Winchester would be kidnapped and possessed, and were forced to revise the script multiple times to reflect the latest choice. Because of Jeffrey Dean Morgan's recurring role on Grey's Anatomy, however, the writers realized that he would not be available long enough to be a main focus of the episode. They thus decided late into production for John to be the one who is captured.^[5] With this finalized, Kripke found it rather easy to write the episode; he already knew that the key elements of the episode would be the exorcism of the demon possessing Meg, the death of the real Meg, and the apparent rescue of John Winchester.^[5] Kripke felt that it had to be John who was possessed by Azazel, as it united and completed the two main storylines of the season—finding their father and tracking down the demon—and it did so by finding both characters in one body. He found it a "happy accident" to be able to present the brothers with the opportunity to finally kill the demon, but at the cost of their father's life.^[6]

The writers believed John's separation from his sons throughout the season "split the show" by having him away "doing more interesting things than the boys are doing",^[7] with Kripke likewise feeling that John was keeping Sam and Dean away from the "front lines". His death would allow the brothers to "explore, investigate and confront the yellow-eyed demon directly". The writers originally intended for John to die at the episode's end, with Sam and Dean surviving the crash but John dying in their arms. His death, however, was pushed back into the second-season premiere because the writers deemed it too dark to kill John after everything else the brothers had gone through in "Devil's Trap".^[8]

Filming

Principal filming took place in Vancouver, British Columbia, with the crash scene being filmed on an old airport space with flat roads.^[9] However, other key sequences occurred in the studio. Because the fight scene between the Winchesters and Azazel at the climax was meant to take place in a secluded, forest-enclosed cabin, production built the set on a sound stage. Production designer Jerry Wanek felt the set was extremely important, as viewers would become uninterested if the forest looked fake.^[6] With Morgan rendered blind by the yellow contact lenses required to depict his character's demonic possession, the production crew placed sandbags on the floor to help the actor locate his marks.^[1]

According to Aycox, the exorcism of the demon from Meg Masters took two days to shoot; the first day of filming lasted 13 hours, while the second lasted for "about a half a day".^[10] Director Kim Manners used 360-degree shots and close-ups to make the sequence exciting.^[11] In the scene following the exorcism, in which Bobby is bent over a dying Meg, Aycox and Ackles read their lines off-screen so that Beaver's reaction could be shot. However, the two were "so slap-happy" to be almost done that they could not stop laughing; to everyone's surprise, Beaver was able to keep a straight face.^[10] The set—Bobby Singer's home—was filled with waist-high stacks of six thousand books.^[12]

Effects

The semi-trailer truck crashing into the Impala at the episode's end was deemed by special effects supervisor Randy Shymkiw to be, as of the third season's production, "probably the toughest 'gag' [he has] done". Many aspects went into creating the crash scene, with filming taking place both in the studio and on location.

For the interior scenes used to depict the first moments of the Impala being hit, the actors were required to sit in the car in front of a blue screen; this allowed for the truck's headlights to later be added in with visual effects.^[13][14] The car itself was attached to a separate rig that was built to replicate the impact of the crash. As the scene was shot, the rig flipped the car onto its side.^[14] The passenger-side window was then shattered, though the actors were protected by a sheet of Lexan that had been placed very close to the window; at the same time, cannons beneath the frame blew out pieces of rubber glass to give the appearance that the window had exploded onto them.^[13]

For the filming of the actual crash, the car and truck were cabled together by a winch and driven toward one another. The intention was for a cannon to launch the Impala into the air at the collision point, causing the car to barrel roll as the truck drives away. However, the car became stuck in the truck's bumper, forcing the cannon to fail and the truck to go out of control. The truck began to jackknife, but the stuntman driving it saved it from flipping. The mistake ended up being beneficial for the scene, as Kripke and director Manners found it to look "pretty real".^[15]