Ole Miss got hosed on that call last night with the backwards pass. First, the officials came out and said there was an inadvertent whistle and the play didn't count and the down would be re-played. Then they came back and said the previous play was under review. How is the play (that they just said didn't count and would be re-played) reviewable.
Also, in the replay, you can see at least one of the refs blowing his whistle to call the play dead before the ball was recovered. So that, in itself, ends the play anyway. So it should have either been Ole Miss ball at the orignal LOS to replay the down . . . or it should have been Ole Miss ball at the point of the ball hitting the ground and the ref blowing the play dead.