In the Owls of Ga'Hoole, there is an extra character who didn't even appear in the books- a Great Grey Owl called Allomere! He was the only character who I couldn't understand, I got confused when his name was mentioned (thinking: Who in Ga'Hoole is Allomere?!)  and I kept thinking he was Twilight! Allomere is an unnecessary addition in my opinion. 

Though the picture is pretty cool!