Watching it again, I'm noticing a few things:
Simmons references "our journey into mystery
The "bus" (the plane) is called a Mobile Command Unit. Note the initials: MCU.
I'm sensing a thread about "third parties" competing with SHIELD to get their hands on alien tech, superpowered people, etc. That's probably going to be a recurring thread, that race to secure them for the side of good before evil gets its hands on them. I wonder if that blonde who discovered Ward ransacking the vault in Paris will recur. The camera paid attention to her retreat in a way that suggests she's significant.
And, okay, Coulson did say a bit more about Extremis: "It's new. Completely unstable."
I'm starting to improve my opinion of Chloe Bennet and Brett Dalton. They both give pretty good line readings, and Bennet in particular handles the Whedonesque dialogue and shifting tones/moods pretty well.