Officer Barbrady's license plate is CTF 1138. This is a reference to
George Lucas's famous student film "Electronic Labyrinth: THX-1138 4EB", that he made while attending USC. Lucas then directed the 1971 feature length sci-fi film
THX 1138 (1971) based on his student project. Lucas also references "THX 1138" in many of his subsequent films, including
American Graffiti (1973) in which the character John Milner drives a car with a license plate reading "THX 138", which Barbrady's plate is directly referencing.