This is the first time in 288 episodes that someone uses the "Christo" trick to see if someone is a demon.
Jack and Dean use the aliases of Agents Berry and Charles. These refer to the artists' Chuck Berry and Ray Charles.
Maddie Phillips has played another character in this show called Janet Novoselic in Halt & Catch Fire (2015). She had brown hair in that role.
The Dean/Jack side of the story is very similar to the 1993 movie "My Boyfriend's Back", a teenage zombie in a red and white letter jacket come back for the girl he loves.
Many of the street scenes were shot on 176a Street in the Cloverdale area of Surrey near Vancouver, Canada. The building used as the exterior for the library is across the street from an actual library.