@Quasar: The comic version of Cap’s shield is most commonly said to be a mixture of Vibranium and Adamantium. Vibranium = the shield’s ability to absorb vibrations; Adamantium = the shield’s (near) invincibility. However, I think that because of the X-Men/Wolverine movies (which are not a part of the “Marvel Studios” universe), Marvel Studios left the Adamantium part out to avoid confusion with moviegoers who would then think that the Cap movie is referencing Wolverine.
The Vibranium/Adamantium thing has been debated by comic fans for a while, due to contradicting/retroactive info in various Marvel comics. But what is in question is the Adamantium, not the Vibranium. (for example: some say Adamantium was created as the result of a metallurgist's attempt to recreate Cap's Vibranium shield).
For more on the subject, check out this link and read about Cap's "Circular Shield":
Thus, the use of Vibranium in the Cap movie is accurate and could theoretically set up Wakanda for a future Black Panther movie or Avengers sequel, as Wakanda is known to have the largest amount of Vibranium on the planet.
As for the Captain America comic book easter egg in the Captain America movie, you’re totally right. This is one of the most clever things Marvel has done yet. In real life the movie is inspired by the comic book, while in the movie the comic book is inspired by “real life”.
@ Avengers1: I think you're on to something there.
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