I'm no Lions hater, but I have to agree with the replay guys in ruling the pass incomplete. Johnson made no attempt to tuck the ball in after grabbing it (which would have clearly shown full control, and thus possession), he let the ball make contact with the ground in a way consistent with entrapment (which is also ruled an incomplete pass), and at 1:07 of the linked video, it almost looks like he's trying to grab the ball back after it's bounced off the ground.
Actually, both teams of refs got it right... the guy on the field for ruling it a TD (plays like this happen so fast that you can't really tell, so you give the guy the benefit of the doubt. Same reason a tie in baseball goes to the runner, really), and the one in the replay booth, who can actually rewind and look at the play from multiple angles.