Emerson gives his phone number as "KLondike 50155," listing the phone exchange by name as was common in the 1950s, before they began listing the numbers which represented the exchange. In this case, KLondike would be represented by the equivalent for K and L, or 5 and 5, making the number 555-0155. This keeps the traditional '555' numerical prefix used for fictional numbers in television and movies.
The scratch-n-sniff man that Ned, Chuck, and Emerson are trying to save has the name of Lenez. Le nez, in French, means "the nose."
When walking through the sewers looking for Oscar Vibinius, they find a yellow thick hose. Chuck starts chanting "Follow the Yellow Thick Hose", in the same way Dorothy says "Follow the Yellow Brick Road" in the Wizard of Oz. The walls the hose is attached to are made out of yellow bricks.