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.
Critical Research Failure: Though the gross egregiousness of it is much more hilariously noticeable now that marijuana use is much more widespread and its effects a great deal more common knowledge than when the film came out, anyone with half a functioning brain should have known by the manipulativeness and slanted angle of the film how trustworthy it was even then.
Even then, the truth was the final product was simply using Drugs Are Bad as an excuse to show behavior that wouldn't otherwise pass The Hays Code.
The movie goes so far as to claim that marijuana is more dangerous than heroin.
Fridge Logic/Plot Hole: Related to Karma Houdini on the main page. The entire film is told in flashback by the principal... but how did he know about Jimmy running the old man over if he was never charged?
Also the drug dealers don't actually "deal". Nobody seems to purchase the stuff. Do they just give it away?
Well, obviously they get their clients high and then send them to their soda shop, where they spend lots of money on food and drink.
Misaimed Fandom: A movie made in all seriousness to prevent marijuana use is now a pothead cult classic.
Even sober, it's hilarious as long as you watch it as a comedy.
Special Effect Failure: Near the end of the movie, Blanche commits suicide by jumping out a window. It's obviously a dummy that falls.
The Musical (and the movie based on it) contain examples of:
Anvilicious: The movie's message for freedom of speech is, somehow, just as bad as the original movie's anti-drug message.
Cargo Ship: Jimmy with a pot brownie in the movie's Brownie Song sequence.
Cross the Line Twice: Every scene seems to find a new line to cross. You'd think the zenith of its audacity would be when Jesus shows up to tell the main character to stop smoking pot. It isn't.
Crowning Music of Awesome: If you're into theater, you know that the note hit by May during The Stuff (on the lyric when Jack gets stoned and RAPES ME!) is incredibly hard to hit well. It's known colloquially backstage as the Rape Note and is the main barrier for casting May.
Ear Worm: People may find themselves humming "Listen to Jesus, Jimmy" months after seeing it.