Board Thread:Episode Discussions/@comment-1181222-20160728115522/@comment-25122992-20160728204120

I don't think the issue is in the lens which wasn't removed. The lenses turned Kakashi's eyes grey when he was disguised as Sukea. In Kakashi's pic of both omake and anime adaptation, both his eyes are coloured typically black. So it's rather an error, because if the lens remained in Kakashi's left eye, it'd still be grey and thus differ from the right eye in colouring, which isn't the case. In fact, Kakashi definetely must've used the lenses coloured differently from his usual eye colour, otherwise there'd be no point in using the lenses for both of his eyes instead of just one (to cover up the Sharingan).