How we cite our quotes: All quotations are from Thor.
Quote #4
AGENT CALE: Is that one of Stark's?
AGENT COULSON: I don't know. Guy never tells me anything.
This one's a shout-out to the greater Marvel Universe. "Stark" is Tony Stark of course—Iron Man—whom Coulson has deal with on two occasions before and who clearly is privy to info that Coulson isn't. That makes him a little jealous of Stark's position: the fact that Stark clearly is higher up the food chain that he.
Quote #5
LOKI: You know, it all makes sense now, why you favored Thor all these years, because no matter how much you claim to love me, you could never have a frost giant sitting on the throne of Asgard!
And there it is in a nutshell: for all of Loki's aspirations to rule, for all his sinister schemes, he's pretty much doing what he does because daddy doesn't love him best. We'd laugh…but there are more than a few real-world politicians who never outgrew their playground stage either.
Quote #6
LAUFEY: So you're the one who showed us the way into Asgard.
LOKI: That was just a bit of fun, really. To ruin my brother's big day, and to protect the realm from his idiotic rule for a while longer.
Loki lies to Laufey a lot, but we're pretty sure he's telling the truth here. Which means that Loki's jealousy has enough of a hold on him to make him do truly dangerous things— like let frost giants into an arsenal— just to get even.