The only reason John Mulaney enters the stage through the giant floor lift is because he wanted to see if Radio City would actually let him use it. When they did, he used it as the opening to his act.
Certain jokes and bits from this special appeared as part of John Mulaney's opening monologue in John Mulaney/Jack White (2018).
John Mulaney won the 2018 Emmy Award in the Outstanding Writing for a Variety Series category for John Mulaney: Kid Gorgeous at Radio City (2018).
John Mulaney told an early version of the "Horse loose in the Hospital" bit on Octavia Spencer/John Mulaney/Travis Scott (2016) in 2017, nearly two years earlier.