The Stoop!d Monkey is "surfing the 'net"; standing on a surfboard on top of his computer monitor.
During the sketch with the "Wildman", there are three kids playing a game. In later shots it shows on their TV screen "Excitebike" (an N.E.S. game). Those Exitebike clips are from a past episode "Bionic Cow" of Robot Chicken.
Hovito Contractor: "And that skeleton organ that made the floor collapse in Astoria, Oregon?"
This quote is an allusion to the 1985 movie The Goonies. The skeleton organ is a trap set by One-Eyed Willie. Only by playing the proper keys would a trap door open; playing the wrong keys collapsed the floor in around the piano.
Hovito Contractor: "You liked what I did with that salt acid trap in Hamunaptra, Egypt, right?"
Hamunaptra, Egypt, and specifically the salt acid trap, are allusions to the 1999 film The Mummy. Hamunaptra, or the City of the Dead, was the location of where the priest Imhotep was entombed. The salt acid trap was a trap designed to kill grave robbers.