Captain America (The First Avengers): Advanced headphones waited a little longer
Most superhero movies like Captain America tend to be very creative with their use of technology, and so we won’t make a big fuss about this error.
The first Avengers movie was set in the Civil war, but we find the super-soldier Jim Morita wearing a headset that is way advanced and only made in the early 2000s. It looks cool on him, though.