Continuity mistake: When Stallone looks out the window in his room, there is rain, and we do not see the horizontal frame. One second later when we see him inside the flat, Stallone's head is just above the frame.
Continuity mistake: Miguel Bain escapes from a police car by snapping the neck of the cop who was driving. The wide shot shows however that the cop is still very much alive and driving. (00:15:32)