there has been a consistent pattern going back years and years of the refs being deliberately slow to call delay of game, almost as if by internal directive to give teams an extra grace second. I've been Cranky Old Man On The Couch about it for most of that time.
I've never seen this much slack, though. This was ridiculous and the entirely forseeable result of the above policy standing so long.
and of course once again it's the Lions. Now that the Raiders have finally behaved a good little corporate citizen and abandoned Oakland, the Lions are the undisputed champion of Being Hated By The League