In which of these 1975 films did Sylvester Stallone appear as an uncredited extra?

"Mandingo" is a 1975 American historical drama film directed by Richard Fleischer and starring James Mason, Susan George, Perry King, and boxer-turned-actor Ken Norton. The film was released by Paramount Pictures.

Based on the 1957 novel "Mandingo" by Kyle Onstott, and on the 1961 play "Mandingo" by Jack Kirkland (which is derived from the novel), "Mandingo" received mixed reviews upon release, but was a box office hit. Sylvester Stallone was an uncredited extra playing the part of a Lynching Witness.

Sylvester Enzio Stallone (Michael Sylvester Gardenzio Stallone, July 6, 1946) is an American actor, director, screenwriter, and producer. After arriving in New York City in 1969 he struggled as an actor for a number of years. He won his first critical acclaim as an actor for his co-starring role as Stanley Rosiello in "The Lords of Flatbush" (1974).

Stallone mostly found gradual work as an extra or side character in films with a sizeable budget until he achieved his greatest critical and commercial success as an actor, starting in 1976 with his self-created role as the boxer Rocky Balboa, in the first film of the successful "Rocky" series (1976–2018).