Thanks to reader Simon Phipps for further explaining Triple H's taped Wrestlemania entrance:

"I've just returned to the UK from Mania and I though this might be worth pointing out perhaps, if it wasn't already obvious. During HHH's entrance at Mania, he just stood there with a frame placed infront of him and then someone on the ground gave him the signal to start walking. While I was suprised to see on the Tron higher up behind the set what was actually being broadcast.
Watching it back now I can see how there is glass everywhere while he starts to walk down the ramp - then they cut to the crowd - then they cut back to him walking without any glass behind him. So it was all done earlier in the day.

The crowd for RAW the next night was so much hotter than it was for Mania. I spoke to a number of people while on the way out of the Toyota centre and we all agreed that RAW was our wrestlemania."