My ex- (We went as a family group: me, her and her boyfriend, our daughter and son-in-law) may have discovered an interesting, REALLY well-buried Easter egg. I don't KNOW that Whedon is devious enough for this, but I wouldn't put it past him.
As we were watching te film, she looked at the "64" fleet number on the helicarrier and, coming from a naval family, asked me if that was the fleet number of the Enterprise -- she seemed to think that it might have been. I didn't know offhand, but it sounded about right.
Turned out that the U.S. Navy aircraft carrier "Enterprise" is officially the CVN-65 so -- close, but no cigar.
In her searching, however, she found something interesting. There were actually TWO U. S. aircraft carriers with the number 64. One was the U.S.S. Constellation, a diesel-turbine vessel launched in the early '60s and decommissioned in 2003.
The OTHER one, however, was a lot more interesting. In its original form, it was a side-wheel paddle boat built in 1913 as an excursion steamer on the Great Lakes and named the Ceeandbee, for its operator, the Cleveland and Buffalo Trancit Company.
During WW II, the navy acquired it and converted it to an aircraft carrier for use on Lake Michigan as a training vessel for student pilots practicing carrier landings and take-offs. When it was recommissioned, it was given the vessel ID number IX-64.
Oh, and it got a new name, as well. The Wolverine.
Is the helicarrier a side-wheeler...? Well, yeah... sorta... Did Wolverine make it into the Avengers movie as he has in the comics...? Ma-a-a-aybe...
It really depends on just how geeky and devious Joss Whedon is.