That first day we were trying to get Dan’s eyes to be green because that’s what they are in the book.
And Dan was wearing contact lenses.
He was allergic to them and after we made the decision to remove them, but the first day we tried to work through it.
So for the last scene when he’s saying good-bye to Hagrid you can see almost his eyes tearing and his eye a little bit swollen and it feels like he’s about to cry.
He probably was but he never complained.
We removed the contacts and he’s never had green eyes since.