Nope. It's grammatically correct as pop is being used as a countable noun in this case. I believe it's referring to popping a value off of a stack and stacks have dimension so one can grammatically say that there were too many just as one could say that they took too many apples. Much would only be used if there was no previously established way of counting. As in: He ate too much food. No unit was specified so one has to use much instead of many.
Anyway, I hope you were being serious and I didn't just over analyze a joke.
Oh, and to my knowledge we haven't seen a too many pops message in quite some time.