The yellow post-it note covering Fin's laptop camera disappears and reappears in between frames.
Lieutenant Benson says that the suspect has killed the victims "every two weeks for a month." To have three victims, one might assume the suspect would have needed six weeks, with a victim every two weeks. But actually, "every two weeks for a month" produces three victims, when counting the month from the date of the first victim's death to the date of the third victim's death. If the first victim is killed on the 1st, then two weeks later, on the 15th, the second victim is killed. Another two weeks later, on the 29th, the third victim is killed. Therefore, in one month, there are three victims, killed every two weeks.