I would imagine a lot is called out there, but they are given rough ideas. Order of elimination can just go with 'When you see Tyson Kidd, he is number 11 and you have to be out before 12 comes out" and so on, plus there are a lot of referees around to keep track of everything.Is every single part in the rumble planned before the match?
Do all the participants know who should eliminate who, and when?
And what order everyone comes out in?
Obviously the major spots are planned, like the last 4 etc. But how much is called during the match?
Spots I would suggest are planned too, ie Morrisons parkour in this years rumble and Hornswoggles moment, but not given a timescale.