Easter egg: Click on the SHIELD icon on the main menu to access profiles on the Avengers.
Factual error: In the scene in Stuttgart, we see a "reserved parking" sign written as "Reservierten Parken". First of all, this is grammatically wrong - if used at all, it should be "Reserviertes Parken". But you wouldn't find a sign in Germany saying that. They say "Reservierter Parkplatz".
Natasha Romanoff: This is the Tesseract, it has the potential energy to wipe out the entire planet.
Bruce Banner: What does Fury want me to do, swallow it?
Trivia: Mark Ruffalo is the only actor to be credited as both Bruce Banner and the Hulk.
Question: How would Bruce be able to get Calcutta? He's made it a habit of never using anything that could be used to track him, so going anywhere, even to another country, would seem impossible.
Answer: People have been smuggled in and out of countries for decades, grease the right palms and talk to certain people, if you don't get in under the radar, phony papers could.