"Mangroves are relatively small, so we made the trees twelve to fourteen feet around. Bigger, even, than the redwoods in Northern California." - Production designer Stuart Craig, on the trees that inspired the Forbidden Forest
Actor Jason Isaacs (Lucius Malfoy) gave this input on his character's costume: "I wanted his costumes to reflect this sense of the old. He wears furs and carries this amazing snake-head cane, feeling himself to be very regal and superior."
Two versions of Hagrid's hut were created to make him appear larger! Actor Robbie Coltrane was filmed on a normal sized set, and the other actors were filmed on an oversized set with extra large props so that their characters would small by comparison!
Graphic designers MinaLima estimate that they created about 140 unique product designs just for the Weasleys' Wizard Wheezes shop! Some of these then needed to be replicated hundreds or even thousands of times.