In The Two Towers, when Gandalf goes to see Theoden the king has a massive beard that rivals that of Gandalf.
When he is free from Saruman's enchantment, he nearly falls down and is caught and supported by Eowyn. He still has his beard at this point. The camera then shifts its focus to Eowyn's face before focusing on Theoden's face. When it focuses on the Theoden's face, his beard is gone!
Where did his beard go - and how!?