Behind the scenes video for the sort of builds Steve has in the movie, not sure how many of these made it in though.

There is speculation that the happy ghast was indirectly inspired by Mumbo's suggestion of a piglin riding a boat riding a ghast.

In this Mumbo Jumbo Minecraft redstone video, Mumbo takes a look at all of the redstone contraptions he built for Mojang Studios 'a Minecraft Movie' directed by Jared Hess and starring Jack Black, Jason Momoa, Emma Myres, Danielle Brooks and Sebastien Hansen. These Minecraft movie builds range from small redstone contraptions, to giant walking robots.