In this episode Dr. Graiman makes a reference to K.A.R.R. (Knight Automated Roving Robot) which was the first super car that Knight Industries built and was first seen in the episode Trust Don't Rust. Due to a programing malfunction K.A.R.R. was deactivated and put into storage. This resulted in the first K.I.T.T. being built. The two would face off at the end of the episode, resulting in K.A.R.R. jumping off a bridge in order to save itself from a head-on collision with K.I.T.T.. K.A.R.R. would later make a final appearance in the episode K.I.T.T. vs K.A.R.R., were the rogue super car was finally destroyed.
In this episode, the characters pronounce "samhain" correctly (sou-en, "sou" as in "south") as opposed to shows like "Supernatural" where it is pronounced "Sam Hain", Halloween in the Irish language (Gaelige) is called "Oiche Shamhana" (pronounced EE-hah How-en-AH) translation: "Night of Samhain"
"Samhain" is also what the month of November is called in the Irish language.