For those who don’t remember the exact details, the middle movies of Marvel’s Phase One did some clever things with the young big screen comic book franchise.
Sadly, we haven’t seen any timeline crossover like this since then.
In the scene with Tony Stark and Nick Fury at the end of Iron Man 2, a screen can be seen broadcasting the same news report that is shown in the Louis Leterrier feature after the big green monster tears up a college campus.
As Kevin Feige points out, the whole deal with Agent Coulson traveling to New Mexico was because he was investigating the Mjolnir crash site, but the Hulk reference is much more subtle.