Alan Ackles, Jensen Ackles's father, has an uncredited part as the voice of a newscaster heard on Bobby's TV. Jensen Ackles has seen the part on the script and thought his dad could do it. The part was recorded over the phone as Alan Ackles sat in the studio in his house in Texas, in his bathrobe, sipping his coffee.
The character Gavin MacLeod is named after actor, Gavin MacLeod. Among his many roles in movies and television, MacLeod is best known as Murray Slaughter in Mary Tyler Moore (1970) and Captain Stubing in _"The Love Boat" (1977)_ (gv).
Rufus mentions that some items from Gavin McLeod's ship are on display at the Maritime Museum, specifically Gavins ring, in a later episode Sam and Dean have to visit the display for a haunted necklace, oddly enough belonging to Gavins jilted lover.
Bobby says to Crowley: "I'm going Dateline on your ass" before he reveals a glow-in-the-dark devil's trap. Dateline NBC (1992) was known to feature hidden camera sting operations for catching sex offenders and con-men. Crowley's reply "I hope that's paint" may refer to the fact that human sperm glows under UV light.
The character of Gavin MacLeod was a passenger on a ship that went down and was lost at sea. This is an in-joke reference to the _"The Love Boat" (1977)_ (gv), although there was no love lost between Gavin and his father, Crowley.
When the FBI agent comes to Bobby's house, Bobby says he has a body in the basement as well as the yard, but later, you see that the "body" in the basement would actually only be ash as the demon burned to death.
At the end of the episode when the boys are driving and talking to Bobby on speaker phone, Dean is steering from the the right side of the car. That's because they're still in Scotland after digging up Crowley's bones. In the UK and most of its territories, they drive on the left side of the road and the steering column is on the right side of the car, directly opposite to the U.S. and Canada.