In the episode where Rocko has suddenly figured out he owes a lot of money to the pizza place...he has a yard sale to raise the money.

Long story short, he is saved when a spastic art lover takes Heffer's melted G.I. Jimbo doll to heart. The art lover buys it for almost as much money as Rocko needs (minus a few cents).

Well.....when the episode is complete..and all is well...Rocko and Heffer are shown in a side-angle shot walking into Rocko's house. In the background on the table you will still see the melted G.I. Jimbo doll sitting there as if it was never sold!