Dean Jones, Harry Wismer, Sam Taub, Bill Veeck and Len Lesser

In addition to Steve McQueen appearing as Fidel, he is one of the group who is there when Rocky sells some stolen items to a fence, and then winds up taking his reimbursement as a suit of clothes, Dean Jones also has a small role in this movie. Dean is one of the soldiers in Rocky's tent when he trys to get some of the guys to go into town with him. Jones has one speaking line.

Also appearing in the film are Harry Wismer and Sam Taub playing themselves. Both appear ringside at the Zale fight in Chicago. Wismer was a very well known sports broadcaster and Taub was also a sportscaster best known for his association with boxing. Taub does the fight's play by play.

Len Lesser, Uncle Leo from Seinfeld, also has a small part as a reporter. He appears ringside at a training session and has a line where he declares that Rocky is a lock in the Shank fight, a warmup to his facing Zale for the second time.

There is also one interesting sighting not listed in the IMDb cast. During that fight with Zale, we see Bill Veeck on a closeup as one of the fight patrons in the Chicago audience. Veeck was a promoter and baseball team owner of several franchises. He is probably most famous for signing a midget, Eddie Gaedel, to a one day contract for the St. Louis Browns. Veeck, a Chicago native, later bought the White Sox and introduced the exploding scoreboard to baseball and Comiskey Park. He also wrote an autobiography in attempt to explain his volatile style and the correct way to pronouce his name that was called Veeck as in Wreck. Today his son Mike owns a minor league franchise.