“He didn’t have any choice the receiver was holding his facemask. You can see it at the start of the video here:
http://ftw.usatoday.com/2015/01/refs-pick-up-flag-dallas-cowboys-detroit-lions
The receiver did let go when the ball was thrown...”
None of this matters. Defensive pass interference is not a reviewable play/call by replay. What does matter is that they called DPI, announced DPI, then waived DPI. Why?
The best wild conjecture I have is that the ref called off interference, the judge thought he meant defensive and straightening it out decided on a no-call.
Hey: it fits what happened without invoking anything weird.
Seriously, there should certainly be an explanation coming from the league.