90% of the contents of the documentary we already knew, but it is presented in a fresh way - in my opinion closer to the supporters' experiences than many previous documentaries. And there is 10% or so of new material, including film from the BBC archives that had previously been held back, which shows how poorly the emergency services reacted and disproves the original coroner's deadline, beyond which it was assumed that no lives could be saved.
Apropos of nothing in particular, I was a classmate of Dr. John Ashton, the public health specialist who was present at Hillsborough and appears in the documentary. Ashton was critical of the emergency services and says that Lord Justice Taylor subsequently cast doubt on his medical credentials, as his specialism was public health and he was therefore not a "proper doctor."