Industrial Light & Magic worked on this movie and Harry Potter and the Prisoner of Azkaban (2004). Buckbeak and the Griffin in this movie have identical heads.
The bulk of the events of this movie take place in one day.
The facial features of the brownie, "Thimbletack", bear an uncanny resemblance to those of Sir Laurence Olivier. This is most apparent in the scene where Aunt Lucinda (Dame Joan Plowright, Olivier's widow) calls him "my little guardian angel".
Despite prominent billing, actor Nick Nolte has approximately 4 minutes of proper screen time although his voice is heard throughout the film in other scenes.