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: Rayman (1995)
Breather Boss: Skops the Scorpion could very well be easier to defeat than Moskito. It's a little weird, since after Skops comes the final level where Mr. Dark presides.
May actually overlap with What Could Have Been: As a beta screenshot on the PS1 box reveals, he was supposed to be a very early boss fought in the Dream Forest (perhaps even being the first boss in the game) before they moved him up and replaced him with Moskito.
Demonic Spiders: The Stone Men. They thow lava balls that split into bits that can harm. You have to punch them several times before they collapse... a moment before they revive themselves like Dry Bones.
Goddamn Bats: Anti-toons. They are small, which means you have to be below them to hit them (or duck after throwing your fist while they are coming towards you), and have an annoying habit of coming-and-going on tiny, often slipery platforms just to be sure you fall to your death.
Most Annoying Sound: That gasping shriek Rayman makes whenever he is hurt by something, and considering the amount of things on this game that are out to do nothing but hurt you, you will hear it a LOT.
Most Wonderful Sound: That "YEAH!" when you finish a level. It starts off as a rather hilarious sound effect, but turns into one of the most wonderful sounds ever when you complete an especially difficult level.
Polished Port: The Sega Saturn port, which had color transparencies, crisper sound and scene transitions unique from the PlayStation and Jaguar ports. However, its missing the password system and one negligible track of music, and the FM Vs are more compressed than the PS1 port. Also, all three of the PC re-releases notably have new custom-made bonus levels made by the fans and developers, as well as a level editor. The only downsides are that the soundtrack was cut down and the cut scenes had to be removed from Rayman Forever because there was too much content to fit them in.
That One Boss: The second encounter with Space Mama. First she's at the end of an already hard level so you can't save your game before her. The battle is quiet long and while you may have 5 hp reaching her if you died the first time (wich is likely), you'll have to redo the entire battle with only 3 hp!. The next two boss look easy in comparison.