When Abby is in her room listening to the Mayhem LP, she looks in a mirror and begins to draw an angled vertical line on her face. When there is a cut to close up, the line has become a curved line resembling the number 3 tipped sideways.
When Abby is speaking in the television studio, she is visible on the monitors. Yet all the cameras are pointing at the people on stage. It's impossible to be on a broadcast monitor without using a camera.