-various posters around the game world that read stuff like "evil is entitled to all it creates"
-the minions go on strike, preventing M&L from entering a certain area for a period of time
-gag in the latter half of the game where Bowser commands fire the cannons & Kamek reminds him that the minions are on their union-mandated break. Bowser replies "Fine! Finish the break. THEN FIRE!!!"
-bonus gag: Bowser actually is totally ok with them unionizing, but Kamek isn't, which is why the minions are striking and having negotiations and such