The video of Pierre Chang talking about the future was dismissed by the writers as being non canon because they weren't able to explore that story. What if we end up seeing that video being made in season 6. After the bomb goes off. Jack and crew meet up with Pierre Chang and make the video. Yes, we heard Faraday's voice however, they could easily change that or think of something else like another Faraday coming back from the future etc..
What if the reason Chang looks down at his arm is because it is recently injured during the incident at the swan site?