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.
Greedy jailor digging out the gold scarab for himself? Predictable. Gold scarab turns out to be a real one and starts eating into him? Not funny. Greedy jailor inexplicably running screaming across the cave to smack into a wall? Funny.
Imhotep physically taking the American's eyes? Not funny. Imhotep winding up with the guy's astigmatism? Funny. And that's why it didn't happen (or at least, isn't shown overtly; it's used as an explanation as to why Imhotep called Evy by Anck-su-amun's name initially, with the addition of being fixed once he is fully regenerated) because the producers wanted to keep Imhotep scary.
Designated Villain: Various characters talk a lot about how Imhotep will destroy the world, but the only goal he shows any actual interest in in the first film is resurrecting his dead girlfriend. His existence is more the problem than anything else because it brings about the Biblical plagues in Egypt. These don't necessarily seem to be his doing, but the very fact that his rise to power is accompanied by water turning to blood and the sun being blacked out is problematic.
Played with in The Mummy Returns. After all, after regenerating Imhotep essentially has what he wanted in the first film: his love, and eternity with her. With the whole Scorpion King plot, he just got greedy.
Fan Dumb: Many reviewers and other people did a great deal of smug snarking about the reference to metal being one of the "elements" the Dragon Emperor could control, seeming to believe this was some moronic error on behalf of the writers since it wasn't one of the four standard elements in western mythos. However, Chinese mythology does regard metal as an element, meaning that it was one of the things the filmmakers got right.
Genius Bonus: Some of the Americans mock the heroes' discovering of Imhotep's "juicy" mummy by saying that maybe if they dry it out, they can sell it for firewood. Many mummies actually were destroyed by ancient tomb robbers using them as firewood.
Hilarious in Hindsight: In Hero Jet Li is trying to kill the first Emperor of China. In Tomb of the Dragon Emperor he is the first Emperor of China.
In the first film Rick makes a crack about Imhotep "getting frisky with the Pharaoh's daughter" to Evy. Hilarious when you consider Rick himself gets frisky with Evy who is in fact the 2000 year reincarnation of the Pharaoh's daughter Nefertiri. It is implied that Rick himself is a reincarnated Medjai. I smell a Fan Fiction.
Idiot Plot: Wouldn't the Medjai, the secret society that're entirely responsible for keeping Imhotep in check lest he ever get out, know that the Book of the Living would send him back down?
To a lesser extent, there's the fact that this curse, reserved for the worst of criminals in Egypt, does literally nothing but benefit the cursed individual.
And then there's the fact that, if only Anck-su-namun told the Pharaoh that she had an itch when he finds her and that's why the ink's smudged, none of this would have ever happened.
Jerkass Woobie: In the end, all Imhotep wanted was to be with Anck-su-namun, even if he has to conquer the world in the process.
In the first movie, the subtitles get in on the action. During the scene where Imhotep and O'Connel have ascreaming match before Rick blows him in half, the subtitles read thus:
Imhotep: SUPERNATURAL ROAR
Rick: MACHO ROAR
Oh Crap: A particularly hilarious one by Izzy in the second film when his dirigible runs out of gas and begins to sputter to a halt.
Izzy: ... Well that's not good.
Sequelitis: The Scorpion King 2 is a prequel to a prequel to a sequel to a remake of a movie from the 1930's. Wheras The Scorpion King 3 is a sequel to the first Scorpion King film, which in fact was the prequel to a prologue of a sequel to a remake of the movie from the 1930's. Head hurting yet?
The third film's filled with it. Best exhibited with the Yetis and three-headed Hydra.
Squick: Imothep kissing Evy when half his face was still that of a rotting corpse.
Even worse, his lips turn back into a rotting corpse while he's doing it! Was that REALLY necessary, Universal?
They Changed It, Now It Sucks: In the third movie, where Evy's actress was changed. Some fans of the original were very disappointed in this. Justified in that Rachel Weisz was just recovering from her pregnancy at the time. Plus, she reportedly turned down the film after a brief look through the script.
They Wasted a Perfectly Good Plot: The second film you have Imhotep and the Scorpion King, two ancient, incredibly powerful supernatural beings who are set to battle one another for control of an army of Anubis warriors for the fate of the world only for Imhotep to conveniently lose all his awesome powers moments before the fight. This is so Rick can be the one to defeat both Imhotep and the Scorpion (since he's the hero of the movie) in what amounts to basically a fist fight with a now-powerless Imhotep and having a lucky thrust with a Deus ex Machina spear, rather than seeing the Mummy with all his powers battle the Scorpion King in all their glory in an Evil Versus Evil conflict.
Unfortunate Implications: They might have captured the flavor of old-fashioned adventure stories a little too well. You have a cowardly, greedy Jewish character in the first movie; a cowardly, comic relief black character in the second; a lot of disposable native Mooks... not to mention the evil, undead pygmys. It's even more unfortunate when you consider the fact that Evy and Jonathan's mother is stated to be Egyptian. They could have cast biracial actors in those roles, but instead only cast POC in villainous or supporting roles.
While Beni might be of Jewish descent, according to his backstory he was run out of Hungary for robbing synagoges and other places of worship, showing that while he's a petty thief, he's clearly not religious. Also, the Egyptian curator and the Medjai are shown to all be of Egyptian descent and frequently serve as Big Damn Heroes. Likewise, there are just as many villainous characters who happen to be white.
Visual Effects of Awesome: The first two films feature some great special effects work, all aspects considered. The third however, to a much lesser degree due to moments of fairly jarring Special Effects Failurenote it's worth noting that Digital Domain (usually quite good) and Rhythm & Hues were used instead of ILM; and with the exception of a few scenes, the latter turning out bad results, specifically Jet Li's character transforming into King Ghidorah as well as his character beheading someone earlier in the movie.
The commentary notes that at times, the effects (such as swarms of insects or clouds of sand) were used to cover up the terrible acting of their crowd scene extras, so this was a case of the visual effects actually improving the acting level in a movie.
The Woobie: Poor Mr Burns. He doesn't seem as much as a jerkass as his companions and when Imhotep gets released he loses his glasses while he's alone in a dark tunnel. Then he gets his eyes and tongue ripped out and then later on meets the man who did it seconds before he has the life sucked out of him.