Spot the difference and win nothing

Noel "Gnome Lover" Nolan, is not famous around these parts but if there was any justice, he would be. This most dedicated lover of gnomes is not a Bon Jovi fan, not a fan of the Star Wars prequels and not someone who doesn't dress like a gnome. Look with your eyes on this picture and see if you can spot the difference between him and his gnome posse: