The Mouse saves bugs from continuing to be eaten by a woodpecker. Helping bugs is a recurring Easter Egg in the adaptations of Donaldson/Scheffler books and can be seen in other films such as Stick Man and Room On The Broom.
There is a Gruffalo ride at Chessington Adventure Park. It is a gentle river ride through the story, touching on every element in the story. Everything there looks like it has been taken directly out of the movie.
Helena Bonham Carter, Sir John Hurt, and Robbie Coltrane appeared in Harry Potter and the Deathly Hallows: Part 1 (2010).