1. Chris Evans was initially uninterested in Captain America. He declined the role 3 times before accepting. It took the director and producers to convince him to take the role.

2. Originally, cameos had been planned for James Logan Howlett (Wolverine) and Erik Lensherr (Magneto) due to their existence during World War II (Logan as a soldier and Erik as a prisoner). However, due to rights issues, these cameos were scrapped.

3. At one point, Sebastian Stan was considered for the role of Captain America, but instead got the role of Bucky Barnes.

4. The Captain America comic book shown in the movies bears the cover of the actual Captain America #1 released in 1942.

5. In the movie, a body double was not used for Chris Evans for the scenes when he was skinny. The filmmakers utilised digital technology to 'shrink' Evans down, essentially erasing portions of his physique, until they came up with what the filmmakers call "Skinny Steve". They shrunk his skeleton, took out some of his jawline and even made his shoulders less broad. They didn't use a body double because nobody else would be able to move the same way as Chris Evans did.