Anticlimax Boss: Jaffar in the SNES version. Unlike the PC versions (DOS & Macintosh), there is no chase or Mind Screw level; you just walk up to him and flame him.
Demonic Spiders: The disembodied goblin heads. In the ruins levels, they're extremely common, but they require extremely precise timing to damage. If you mess up, you take a nasty counterattack for your trouble.
Good Bad Bugs: In some version of the game the entrance door on the first level of the ruins remained open, allowing the player to exit through it and skip the entire level.
Porting Disaster: The SNES version has missing story cutscenes, glitchy controls and play mechanics, and the final level is axed in favor of just shooting a fireball at Jaffar. Compared to the well-regarded SNES port of the first game, this one is horribly underwhelming.