When Lisa is typing and scrolling on her phone, over the shoulder shots reveal she is on a lock screen.
During the reveal, Kumail Nanjiani crowns the murderer. The camera turns away and when it returns to the murderer, the crown is gone. The camera turns away again. Upon return. The crown is in place again.
The uppercase letters used by the killer differed from each other on the note vs on the locker. The uppercase letter "I" did not have the horizontal serifs at the top and bottom of the letter on the murder note found with the body, but did have them on the "I"s written on the locker.
Kevin Rivera, suspect #1, had carpal tunnel syndrome that was so severe he had to wear wrist braces and could not throw properly, yet was quickly and ably typing code on his keyboard when approached by the detectives.