Ball says he nearly overlooked O’Brien:
I saw thousands and thousands of people. Dylan was actually…I saw him early on, very early on and I overlooked him. It was a big learning experience there, because I overlooked him because of his hair. He had Teen Wolf hair and I couldn’t see past that and so we were looking for our Thomas and it’s a tough role to make, because he comes in as a boy and he leaves as a man, so it cant’ be like this badass action star that comes into this movie … we brought him back in and we started to talk with him and I’m like “oh my god,” he’s the coolest dude ever.