An actor is shown posing in front of a mirror, but off to the side so that the camera captures his reflection. Given the slender width of the mirror, the actor is seeing only the camera in the reflection, and cannot actually see himself.
One of the Paramore posters in Vivian's room features a logo with three slashes for the E in "Paramore", which the band didn't start using until 2013. The film takes place in 2008.