Also Monty Python. I think it never would be possible today to release such movies to theaters.
George Harrison of Beatles fame ended up funding the movie, I believe almost entirely out of his own pocket. This was back in the 70s.
It wasn't “someone has suggested/demanded it be removed, and we have refused” but “if someone did suggest/demand it we wouldn't”.
The top marginal rate of income tax was ~90% and this heavily encouraged investments like this. It meant that there was more space for creative risk taking as well as more commercial/industrial capital investment.
Back then, the short late-night voiceover, "Portions of the following program may be unsuitable for younger or more sensitive viewers," was the hallmark of Quality TV.