"J'assume" -- he's taking on his responsibilities?
"Didiou" is... a euphemism for something-or-other 'de Dieu"?
Jet-lag -- of course, Raoul had to travel the hard way
Interesting idea of a spell that 'calibrates' on its own after the owner has finished the conscious casting of it (or is it the crystal that's calibrating?)
'My roommate's enemy is my friend', evidently
upset at Christine?" -- yes, that was my own immediate reaction to Jareth's comment! And yes, it's not really the most reassuring accompaniment to 'this spell is very complicated to set up'... Raoul has got to be wondering just how careful the Goblin King is feeling about his work at this precise moment...
And being irrational about Sarah has definitely been one of Jareth's more self-evident traits so far as Raoul's experience of him has been concerned
So Christine-as-Christine is an object of resentment for prompting Sarah to save them all by using her canon powers to wish her friends home (what would have happened if she hadn't, I wonder? Would all the guests simply have ended up in Jareth's castle?) But Christine-as-Sarah's-friend is an object of transferred reverence who is absolutely safe in Jareth's hands
(Interestingly, Jareth doesn't seem to be holding any -- audible -- grudge against Christine for the attempt to tackle him at the ball over Erik's revelations that resulted in the mindwipe in the first place. Or is he just demonstrating enough self-awareness to avoid potentially stirring up that particular ants'-nest in Raoul's presence?)
Raoul goes all nineteenth-century on him for a moment... and Jareth, I think, tacitly concedes the point, or at least changes the subject.
And apparently Jareth is also recruiting the services of a native guide