Yes that was a shocking decision, I think that lead to challenging pass interference calls for a season and then it was dropped again.
https://www.youtube.com/watch?v=vS40iaejHT0
NFL plays that are reviewable, including the following:
Completions/Incompletions;
Fumbles (a team must have clear possession of the football to be overturned);
Spot of the ball;
Runner down by contact;
Goal line plays (if a play is not called a touchdown on the field);
12 players on the field...