Over the course of several scenes, Jamie's injured hand goes from severely mangled to merely covered with blood and back again. This is likely the result of the scene using several prosthetic hands as well as Sam Heughan's own hand covered in make-up and fake blood.
When rescuing Jamie the door is knocked off it hinges and lands on top of Jack Randall. When Murtagh looks down at him he is lying the wrong way. He would have fallen backwards with his head away from doorway. As Angus leads them out he pushes open the door which had previously been ripped off its hinges.