WhatCulture.com provided some details regarding the production of the Boneyard Match between The Undertaker and AJ Styles at WrestleMania 36 – Night 1 in Orlando, Florida at the WWE Performance Center on the WWE Network.
Here are some of the notes:
The match was filmed in Florida. An outside production company built the barn that was used in the match. It took five days to build the set and the match itself took eight hours to shoot.
The dialogue between Undertaker and AJ Styles was said to be “100% improvised. Triple H was supportive of letting them talk as much as they wanted.
Undertaker smashing the hearse window and busting open his arm wasn’t a planned spot but WWE officials felt the shot looked good so it was kept in the finished product.
It was reportedly Undertaker that pitched the idea of having Styles’ hand stick out of the grave at the end of the match.