An older version of TMWNN filled with guilt and/or regret......, I feel that way. When Unforgiven was over we were leaving the theater and two older guys I was walking past commented on how that was the worst Eastwood movie they ever saw.
They obviously wanted a Leone film.
Sticking with Eastwood:
Kelly's Heroes had that showdown bit referencing the Good, the Bad, and the Ugly.
Dirty Harry had the movie Play Misty For Me on the theater marquee in the background.
Newhart, in one episode Dick and Michael are discussing old 70s TV shows and Michael says "Remember the one with the shrink who stuttered?" And Dick said "St- stammered."