Visible crew/equipment: A reflector screen is visible on Hawkeye's sunglasses at the very end when Thor and a restrained Loki are returning, presumably, to Asgard. (02:06:10)
Visible crew/equipment: During the New York attack when the cars are being blown up, the shot cuts to inside a taxi. When it does this the taxi flips over and part way through the flip a cable can be seen attached to the taxi. (01:38:55)
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".
Steve Rogers: What's the matter? Scared of a little lightning?
Loki: I'm not overly fond of what follows.
Trivia: When Loki is grabbed by the Hulk and repeatedly smashed into the floor, Tom Hiddleston had a rope tied around his ankle which was pulled to achieve the effect. Although, Tom was told that the rope would be pulled while speaking to the Hulk, he was never told when the rope would be pulled so his reaction to quickly be pulled down was real.
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.