lionhead

Corrected entry: Okay, giving the movie a huge benefit of the doubt and say that it is in fact possible for Black Widow to survive a hand grenade exploding three feet away by hiding behind a mercenary, it's inside of an armored car. The sound of the blast alone would be concentrated by the metal walls, and leave her very deaf.

Friso94

Correction: She could be wearing earplugs, 1 for a radio the other to protect her ears from explosions.

lionhead

Corrected entry: When Tony watches the recording of his parents killing by the Winter Soldier, you see the latter shooting the surveillance camera (why there was a camera there in the first place is unknown) in order to avoid being recorded. That is obviously idiotic, since shooting a surveillance camera most likely doesn't result in the destruction of the recording, which is typically kept off-site as well. He should have destroyed the camera before being recorded himself.

Epigenis

Correction: He didn't notice the camera until then. He shot it in frustration or simply because he is ordered to do that whenever he sees one.

lionhead