Originally Posted by Canis Sapiens
They could insert "The ImmigrantSong" in the final credits... ala Black Sabbath's "Iron Man" in Iron Man.
On a second thought, now that part of the movie will be set on modern Earth, maybe they could show somebody somewhere (a biker, perhaps?) playing the song out loud in public and attracting Thor's attention.
I can almost see Thor's WTF expression.
That's the only way I can imagine it fitting into the film. And it would still be a fairly obvious ploy.