Those of us familiar with the book will know that half way through Chapter VIII Bilbo sees dark purple butterflies in the tree tops in Mirkwood - perhaps Iole no less, in abundance: 'he saw all around him a sea of dark green, ruffled here and there by the breeze; and there were everywhere hundreds of butterflies. I expect they were a kind of Purple Emperor, a butterfly that loves the tops of oak-woods'. These were 'a dark dark velvety black without any markings to be seen.' Had Tolkein heard rumours of ab. Iole occurring in nearby Bernwood Forest?
Unfortunately, in the film these seem to have transmogrified into Morpho x Papilionid hybrids. See http://www.youtube.com/watch?v=fnaojlfdUbs
Consequently, Gentlemen, we will have to boycott this film.