The show is kind of inherently Fridge Horrific, since the main character is a mummified Undead Child, but things really get bad after the episode "The Comeback Kid". To sum up, Tutenstein casts a spell that restores him into a living flesh-and-blood boy, but chaos ensues when he forgets to shut off the magic artifact, and he ends up having to undo the entire spell and turn back into a mummy. And, since it was a one-time-only spell, he is now condemned to be a living mummy forever. Think about the implications of that. His Secret Keeper Cleo is going to grow up and (presumably) move on in life, while Tut is stuck hiding in the museum, a ten-year-old child's mind in a mouldering corpse, with no hope of anything better. And, since Cleo is usually the only thing standing between Tut and disaster, it'd be only a matter of time before he either was discoveredby the modern world, pissed off the Egyptian gods again so they carried out their frequent threats of eternal damnation, or lost the Scepter of Was to Set and doomed the rest of the world. Really, Undeath Always Ends is looking pretty good at this point.
While it's revealed Tut died doing a Heroic Sacrifice for his friend, it never explained how Nutka died. It possible he could have been lynched by people he ripped off...
Tut died to save his friend Kapta, but what are the odds that Kapta received a friendly welcome when he returned to tell the news of their king's death?
It's revealed that Tutenstein died under falling rocks, but his body is extremely in tact, which means he wasn't crushed to death. He could have died by head trauma, but it's just as likely he might have suffocated or bled to death.
In "I Did It My Way", after Tut changed reality to resemble his time, Cleo saw his mother as a slave driver and whipping at the builders. Cleo says that's "So not cool!"
Tut never seems to mind when people call him a monster. Maybe that's because they called him that when he was alive, too.
Unlikely because the meaning of the word "Monster" is American in origin. Also despite his mood swings and threats of horrible torture, Tut actually is a decent person. In life he's merely shown pranking other children and he willingly got himself killed in order to save one of his friends.
This may be a stretch, but Tut has an accent - the gods don't. Cleo and Luxor understand both of them. This could be because the gods' speech (and perhaps Luxor's) is simply interpreted by the listener in whatever is the easiest way to understand (in the audience and Cleo's case: American English) while Tut is actually speaking English, which is why he has an accent. It's possible Tut himelf might hear them speaking in Ancient Egyptian, as when his friend Nutka visits him as a ghost, he too speaks English with an American accent. It seems unlikely they would speak to each other in English, so this is probably for the audience's sake. It might be the same way with the gods.
When Tut loses his body parts it's usually a slapstick gag that just adds to the humour and makes sense; he's a mummified body so of course he's going to be falling apart from all that moving around, right? But another way to look at it is his severed limbs being a subtle Shout-Out to Tutankhamun's mummy. You see, when Carter was removing the jewellery from the boy king's body he had to amputate most of his limbs, including the legs, hands and the head to seperate it from his death mask, which was stuck in there with resin. The way his mummy was disjointed after this brings to mind Tutenstein losing his limbs usually from the bone joints or his neck.