So I was watching Captain America and I noticed a few things:
Connections between CA, Thor, and Iron Man
The blue block in CA is from Odin's treasure box (thor). It is also what IM puts in his chest to power his suit. In the avengers Loki is probably trying to find it. That may be why Loki is the bad guy and not Red Skull or someone else. Stark in CA is iron man's father or grandfather.
In the beginning of CA the men find his shield and a man says "call the col." this would be Nick Fury because next he says "this one's waited long enough" so now we know that they are gathering the avengers.