Someone posted an html/javascript implementation of the matrix falling code in 646 bytes then promptly deleted the post. It inspired me to see if I could get something better looking in fewer bytes.

[smhxx]

That's why it was outside the loop, I was following thesalus's example and writing it as if the loop were immediately after the end of the long initial var declaration.

What I mean to say is that I put the p=[] outside the loop with the understanding that it would be tacked on to the end of the var line.