Honestly, that's on Pelini moreso than the officials. Pelini had a challenge available and didn't use it. If it there was ever a time to try and get a call overturned, it's to get a pass ruled incomplete switched around that results in a 1st and Goal from the ~2 yard line.
I don't think a judgment call can be reviewed. And AFAIK, that was the correct call since Enunwa didn't complete the catch all the way to the ground.
He made a football move. He extended the ball, after catching it, with one hand for the endzone after rotating his body forward and having a hand and knee to the ground.