I didn't even notice the burping thing until I read it somewhere on the Internet (I can't remember which site). I guess I didn't really mind—it was a really small glitch, and burping totally seems like the kind of thing Mulch would do, given that he loves food and doesn't mind grossing people out.
There's this one thing I don't think is a glitch, only it kept on nagging me (I think it's already been mentioned in this thread): in The Lost Colony, Butler thinks that Artemis had a backup plan for everything, including going to the washroom, while in The Last Guardian, Holly thinks that Artemis was so convinced of his superior intelligence and planning skills that there often wasn't a Plan B. It's probably just two characters disagreeing—the problem is that both know Artemis pretty well, so who's right?
I said you were smart, Mud Boy. I was wrong; are exceptional.—Qwan
Which do you think seems more suspicious? An alien-looking craft hovering in the yard of a country home, or a floating doorway with a centaur standing in it?—Domovoi Butler
We can only change the future, not the past or present.—Artemis Fowl II
I'm trying to care, Artemis. But I thought it was all supposed to be over when the fat lady sings. Well, she's singing, but it doesn't appear to be over.—Holly Short