Awesome, yet Impractical: The yellow mortar weapon that only appears during boss battles is ONLY meant for boss battles. It also provides free invincibility on pick-up. Trying to aim it at anything smaller than a boss will generally get you killed, as the shells fly high in the air and don't hit anything mid-arc. Despite this, in the arcade version, it can be carried into the next stage.
Bowdlerization: The SNES port removed some of the blood and gibs: the generic enemies armed with clubs still disintegrate into Red Mist when shot and bosses lose their limbs and become visibly bloodied when shot enough, but normal enemies aren't blown to pieces when shot with heavier weaponry and the twin snakes now explode normally when killed instead of spurting blood. More subtly, the host doesn't peek at the women's breasts either.
Which is in turn a Shout-Out to C. M. Kornbluth's story The Marching Morons, which had the recurring catchphrase "Would you buy it for a quarter?".
Color-Coded Multiplayer: Contestant 1 has light skin and wears a blue outfit; Contestant 2 has dark skin and wears a red outfit.
The Computer Is A Lying Bastard: At launch, the arcade version taunted players with a message stating they didn't collect enough keys to access the Pleasure Dome-except the Pleasure Dome didn't actually exist. As detailled in this Polygon feature, the outcry was such that the development team relented and programmed the Pleasure Dome in later revisions.
Deadly Game: And yet no matter how many times they are brutally murdered, the players don't seem any worse off for wear by the time they make it to the end of the course.
The arcade version is literally impossible not to die in, mostly due to slow movement speed without the speed powerup (which has a short duration). The arcade Smash TV is probably designed this way intentionally to eat up quarters. Other ports are mostly difficult for being bad ports. Despite this, one of the developers claims he can finish it in one coin.
That still doesn't manage to explain how evil this game is. Individual rooms in arenas 3 and 4 will run you over 10 minutes each, and later enemies will start to run much faster than you.
Home versions of the game were a lot more popular; the game was no less hard, but seeing as you got unlimited continues and didn't need to waste quarters, it helped a lot.