There are two (sets of) cameos in this strip. One is from a popular webcomic, while the other is real-life peoples. You will likely not know the real-life peoples; they are entirely for my own amusement.

I knew this joke was coming several weeks in advance, but still managed not to put a single background character in the mall. Because I am lazy. Hence this clumsy attempt at squeezing a few in. They will likely not be seen again.