Wander's (as Tumbleweed) encounter with Major Threat plays out the exact same way as "The Picnic".
"The Party Poopers" is a special episode that deals with "toilet humor". The counsel is called "Hi-Nee", which is a pun on "hiney". In addition, everything in the castle is shaped like butts or poop.
The Orbble creators, Wilber and Orbble Wright, are a reference to the Wright Brothers.
This episode confirms Wander was previously known as "Tumbleweed", a name brought up by Major Threat in "The Good Bad Guy". It's also revealed he chose his current name when Sylvia called him a "wandering weirdo" when they first met.
This episode reveals how Wander first met Sylvia when she was a bounty hunter.