Visible crew/equipment: When Nick lights his lighter to burn all of his stuff, two white screens are visible in his glasses. (01:59:00)
Visible crew/equipment: When Romanoff runs into the hospital room (with Steve and Agent Hill already inside) to see Nick being operated on, you can just make out a white tape marker near the bottom of the wall showing where Romanoff is supposed to stand. (00:36:20)
Visible crew/equipment: After The Winter Soldier throws a grenade at the car, Romanoff appears behind and starts fighting with him. Romanoff ties his hands together and the Winter Soldier walks back into a silver car. In the following shot, just as the Winter Soldier aims Romanoff at the other car, it can be noticed that Romanoff has been replaced by a stunt double. This is only visible for a frame or two so you'll have to be quick in order to see it. (01:18:05)
Chosen answer: Black Widow was turned into an assassin and spy at a very young age. She has killed hundreds of people at the request of the Russian and American governments, in addition to many other horrible acts as yet unspecified..
Greg Dwyer