These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Producers
Adaptation Distillation: As funny as LSD was, the hippie jokes wouldn't translate as well to a modern audience. Plus, the Roger De Bris character from the original film was rather undeveloped since they couldn't get away with as much gay humor in the 1960s. Having De Bris play Hitler solves a lot of problems and makes the later versions even funnier.
Springtime For Hitler does this itself, much to Leo's and Max's dismay.
Mel Brooks himself described the film as "rising below vulgarity."
Dude, Not Funny!: The production's use of Hitler and WWII for comedy. Of course, that's the point. In-Universe, Max tries to invoke this and make the show flop, but instead succeeds via Crosses the Line Twice. And in Real Life, Mel Brooks has said he wanted to make the Nazis look so absurd that no one could ever take them seriously again. Considering Mel Brooks himself is Jewish and served in WWII, who can really complain?
To a lesser extent, Gene Wilder's original ending speech. Sure, there are a couple comedic zings, but the innocence and heartfelt friendship that Leo has for Max are made evident at their fullest in this scene.
Leo Bloom: No one ever called me Leo before! I mean, I know it's not a big legal point, but...even in kindergarten they used to call me Bloom. I never sang a song before. I mean with someone else, I never sang a song with someone else before. This man...this man...this is a wonderful man. He made me what I am today...he did.
The Woobie: Leo Bloom is a meek accountant who is nearly driven to a nervous breakdown each time his new partner tries to rope him into his scheme. While Gene Wilder makes him sympathetic, it's only until the Broadway play when it is explicitly stated that he has low self-esteem and feels that he never amounted to anything, and only makes it more heartwarming when he loosens up later on. "I Want To Be A Producer" ends with a truly awesome and heartwarming note!