When Coogan is searching the New York nightclub, the large screen plays a scene from Tarantula (1955), a "B" sci-fi film that Clint Eastwood made early in his career in which he had an uncredited role.
Coogan's Bluff in New York City is the name of a large cliff extending northward from 155th Street in Manhattan. It once was the site of the fabled Polo Grounds, home of the New York baseball Giants, and the first home of the New York Mets before the Polo Grounds were demolished in 1964.
In the final chase, Coogan (Clint Eastwood) rides a 650cc Triumph TR6 motorcycle whilst Ringerman (Don Stroud) rides the 500cc Triumph T100 R Daytona upon which he appears with Linny (Tisha Sterling) in the picture displayed in Ringerman's mother's flat.
According to screenwriter Dean Riesner, who held script meetings after hours with Clint Eastwood in his hotel, "I'd leave his suite, and I'd be going down the hall and there'd be some girl coming down the hall from the opposite direction and heading into Clint's room." Added Riesner: "There were always a bunch of girls around him, I'll tell you that. Gals from the office, gals around the set, gals in the picture."
Just before the shooting, Clint Eastwood had never heard of Don Siegel and Siegel had never heard nor seen any film where Eastwood acted. So both, from their side, watched several movies of each other.