Muppet Christmas Carol Easter Egg - Yet Another Stoner Reference

This one happens while Scrooge is walking into his office building for the first or second time (it's fairly early on in the movie. If the Marley brothers have sung, you missed it). If you look at the nameplate sign, it says "Robert, and ... Marley"
This is an obvious reference to Bob Marley. My dad pointed this one out to me.