There’s a related full-length Attenborough documentary called Dinosaurs: The Final Day that is separate from this series. It’s about the amazing fossil field in North Dakota that seems to contain a snapshot record of the events immediately following the asteroid impact. A review of the documentary here:
A thread about it here:
Personally I was delighted to see an actual high-quality documentary about this amazing discovery that had previously only been discussed in a scientific paper and a couple of magazine articles.