On the official Sam & Max blog, Steve Purcell has shared some unseen concept art of Gytgo, an imported organic Gameboy-type thing that would have found its way into Sam's inventory in Freelance Police and been used to replay unlocked minigames. (You can see his in-game representation here.)
As an added bonus, Purcell has pasted some dialog from the game which includes a song that Gytgo would have sang, and revealing Sam and Max's differing opinions regarding the device's need to be summarily destroyed.
Source: Spudvsion
Nifty concept art. The final render is thinner on the Totoro, which I like.