The name Susan appears on the list of names that scrolls to the left on the bottom part of the screen, and it appears she got 4 friends. Number 4 may appear as a nod to the "you know that she's half crazy" song lyric to Leonard Cohen's Suzanne song.
It should also be noted that Suzanne is another form of Susan, and that 4 is half of 8, of which number 8 is the famous "crazy" number, since there's also something called the "crazy 8s" which is a famous use of number 8.
It should also be noted that Suzanne is another form of Susan, and that 4 is half of 8, of which number 8 is the famous "crazy" number, since there's also something called the "crazy 8s" which is a famous use of number 8.