The 2-minute clip shows the Harry Potter team talking through the camera tricks and visual effects to turn Robbie Coltrane into 12ft-tall giant Rubeus Hagrid.
The Wizard's Collection features 37 hours of special bonus material and more than four hours of unseen content. Also included are extended versions of Columbus's two Harry Potter instalments Philosopher's Stone and Chamber of Secrets.
The Harry Potter Wizard's Collection is out now.
Photo gallery - Harry Potter Wizard's Collection in pictures:
