This week's "modified format" version of NXT On USA had multiple segments pre-taped by WWE and then aired during the Wednesday time slot for the weekly WWE NXT television show.
Multiple sources are reporting that all of the segments with Triple H and Tom Phillips were shot at WWE's headquarters in Stamford, CT. on Tuesday, and once that happened, the company's editing team frantically worked to put the episode together to get it to the USA Network in time to go on the air in their designated weekly prime time slot.
Apparently it was a very close call as the content made it to the network with only minutes to spare before the scheduled air time.
This would also explain why Triple H and Phillips kept referencing WrestleMania as a one-day event when WWE had already announced it as being spread out over two before the broadcast went on the air.
(H/T to PWInsider & F4WOnline)