During the screen footage montage at around 17 minutes, there's a clip of the music video for Girls' Generation's "Holiday", released in August 2017. Later on in the film, at around 44 minutes, there is a calendar in Kayla's room that shows the current month as June 2017. Unless Kayla didn't change her calendar for 2 months, it's impossible for her to have been watching that music video.
Kayla would not be able to watch a YouTube video on oral sex instructions without confirming that she was over 18 years old first.
In the mall scene where Kayla first walks in to meet Olivia, she walks past a number of mid-mall kiosks. One of them has a mirror and you can see the crew briefly reflected as she moves through the scene.