#1. Where were Otis, Tucker and Buddy Murphy?
It was revealed ahead of the Men's Royal Rumble match that Bobby Lashley and Rusev had been taken out because they were brawling in the backstage area. So that off screen altercation opened up two more slots for WWE to include some surprise entrants. Heading into the night there were only 3 open spots after 27 Superstars declared for the match.
Interestingly, even on the Kickoff show, Otis and Tucker were still part of the graphic for The Rumble. Otis made an appearance as part of the Women's Royal Rumble match, but he and his Heavy Machinery partner Tucker were no where to be seen in the Men's match.
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Buddy Murphy was also shown at ringside with Seth Rollins when he entered at number 30, but he didn't enter the match even though he officially announced he would compete.
There was a time when no announcements were made. The stars would be shown drawing numbers on the night instead. This added much more anticipation to the event and stopped fans counting on their fingers throughout the night to see if there were any surprises left.
If plans are subject to change when added to the match, don't announce them at all, leave some things as a mystery in future.