I never get tired of this movie. Back in high school in the 70s my film class teacher let us watch this, it was unheard of. He said if he heard any sniggering during any of it he would shut it off right then so we kept quiet.

He pointed out some symbolism that I didn't get at first, about Callahan and Scorpio on the 50 yard line in the stadium. And the processing plant representing the justice system during the final chase, with Scorpio escaping. He also pointed out that even without a search warrant they would have charged Scorpio for shooting Chico and beating Callahan.

One thing I noticed, the violence in this 1971 movie was unheard of a year earlier. I can't think of any movie from 1969 or 1970 that had anything close to it.

The rest of the franchise got progressively worse for me, although Magnum Force made an effort. ("Me and Smith and Wesson", oh brother. He would have been shot 10 times over before getting to that line)