Now I'm going to be honest: I can't tell exactly what's happening here. Is that the same ghost getting reflected back and forth? Is it lots of different ghosts from lots of different mirrors flying out at once? Why is she flying at all? I kind of figured she would just sort of appear there, or maybe appear in the mirror or something.
I think it's tricky to make a joke like this off of a childhood urban myth: everyone knows a different version of the story, and unless you are thinking of the same one as Randall, it might not make sense.
Honestly the biggest problem I see is that it feels too damn much like comic 537, in that a character goes and tries to set up a needless loop by exploiting some property of the thing in question. They just felt similar to me.
Lastly, no, you're not the only one who was reminded of it, I was reminded of it, too.