The Whole Ten Yards (2004)
Ca. 70 minutes into the film Os jokingly calls Jimmy and Jill by the names of the two protagonists of the old show.
in "Lazy Sunday", movie trivia question: "What Friends alum starred in films with Bruce Willis?" Answer: "Matthew Perry"
Seen on billboard
"Movie Theology with Father Brett" segment
Bruce Willis' character, Jimmy, cries out "Yippie Ki Yay" when having make-up sex with his wife, Jill (played by Amanda Peet).