TheBoost said:
How about Obi's line "How uncivilized" when he kills Greivous.
That's a gag line paying off a line he wont say for two more movies!
If you want to get into that, all the allusions are rendered just as baffling if watched "in order" as they are unnecessary when watched as released:
"This is where the fun begins." [Why is Han saying what Analkid said...?]
"I have a baaad feeling about this." [Why do all the people in this galaxy say that all the time...?]