The structure and animation of the pterosaur in this film is promoted as true to fossil record. So I had to watch it 17 times and "omg" 17 times. They didn't have feathers, they had flaps of skin that ran from their wrists to their ankles. Like bats? Attenborough said it made walking difficult. You can see in this clip how they walked on their wings when grounded.
I wish they hadn't called them monsters.