I was surprised how Zac Efron and Lily Collins both were amazing in it.
I thought they did a fantastic job with the makeup on Efron, he looked pretty close like Ted Bundy. And Zac Efron's performance.. wow! His performance was the greatest thing of the movie. Just look his eyes, he was just scary and crazy in it. I mean, you can see his two faces in the movie. And I was also surprised how Lily Collins was so good in it. Both really nailed the roles.
And to note, I thought this was absolutely a fantastic biography/crime film. I feel people are missing the point.