Stallone 's other first few film roles were small , and he did brief appearances that he did not get credit for in Woody Allen 's Bananas ( 1971 ) as a subway thug , in the thriller Klute ( 1971 ) as an extra dancing in a club , and in the Jack Lemmon vehicle The Prisoner of Second Avenue ( 1975 ) as a young person . Stallone 's other first few film roles were minor , and included brief uncredited appearances in Woody Allen 's Bananas ( 1971 ) as a subway thug , in the psychological thriller Klute ( 1971 ) as an extra dancing in a club , and in the Jack Lemmon film The Prisoner of Second Avenue ( 1975 ) as a youth .