From that first audition that we did he made me feel so comfortable. […] Usually, at auditions, there’s something awkward about it, or you wish you did something differently. Just from that day and every day on set, he really not only did a great job of making us all feel comfortable, but also communicating with incredible efficiency. Like I could really understand what he was going for. He had a clear vision in mind. He just had that comfortability to know what’s going on and know that there’s this very good communication going on which made for a really nice time on set. He’s great, he’really great.
He also talked about some of Tripp's character development that ended up not making it into the movie.
Originally actually we deleted the scene where, in the end, I kind of disown that group of girls. When I’m like “You know what? I’ve seen the true side of you girls. Not cool.” But, yeah, that still is played upon, even though that scene didn’t make it into the final cut. That was definitely the attitude that they were going for. I associate with this group of people that maybe doesn’t jive with everything that I am about. Which I think is just like your classic kind of high school thing. We all kind of go through that where maybe people aren’t as nice as we want them to be in high school to others. But he’s a redeemable character. He sees through that. He’s not bullied like the other girls.
The entire interview can be read at the link above along with an audio version.