People have been saying all year that the replay system is bullshit because they don't want to make it seem like the refs make mistakes.
As Al Michaels said, the ref comes in with one hand up to spot the ball, then suddenly changes his mind to calling it a TD. The ball never crosses the goal line, the replay CLEARLY shows that, but since that would mean they made a mistake and have to admit it, they just come up with the "inconclusive evidence" bullshit and let a bad call stand rather than correct it. It's reaching epidemic proportions when there have been probably 10-20 horrifically blown calls in the playoffs alone. Why they didn't even check the DJ one foot in the endzone catch I don't know, but you'd think a potential TD would be reviewed by the booth.