During the Credits
There are loads of Christmas-themed graphics and of silhouettes of things during the credits of Arthur Christmas. Right at the very end of the credits, there is a shadow silhouette of an elf who throws snowballs at the screen, blacking it out to conclude the film.
After the Credits
There are no extras after the credits of Arthur Christmas.
Song During the Credits
Special thanks to Simon Goldberger for the stinger submission!