Revealing mistake: During the "grand finale" fight scene, which takes place on the underside of an overturned helicopter hanging from a cliff, a few frames show the rigging that is holding the helicopter in place.
Revealing mistake: When every bullet hits the snow it sparks, showing the pyrotechnics of the shots.
Revealing mistake: The explosion happens and Gabe and Jessie seek shelter in a small cave. Before the rocks start falling, Gabe bumps the wall of the cave and creates a hole in the set. This is noticeable on the left side of the screen.
Answer: There are two stunt doubles for Mr Stallone on imdb.com, their names are Mark De Alessandro and Jeff O' Haco. The site doesn't specify who did what.
The-Immortal