Chekhov's Gun: Yo uses one of Fanboy's Man-Arctica comics to prove he isn't a baby. It works.
Cuteness Proximity: Yo and Lupe's entire method of gaining customers at their lemonade stand is to use their girlish charm. When Fanboy retaliates by disguising himself as a baby, the customers immediately abandon the stand in favor of adoring him instead.
Evil Laugh: Fanboy gets one when planning to steal Yo and Lupe's customers. Dollarnator tries to do one, but isn't good at it.
Irony: The girls are giving lemonade to their customers, yet it tastes horrible; they use their cuteness to force them into buying it.
Paper-Thin Disguise: Fanboy disguises himself as a baby so he and Chum Chum can gather more customers at their lemonade stand than Yo and Lupe. Only Yo and Lupe can see through his disguise, which is nothing more than a bonnet and a pacifier.
Puppy-Dog Eyes: Yo has these briefly as Fanboy spies on them. Chum Chum gets these himself as Fanboy and Dollarnator plan something, and again while holding Fanboy as a baby.
Skyward Scream: Fanboy does one while complaining no customers have arrived.
Sound-Effect Bleep: The spilling of coins blocks out the boys' speech, probably to hide the fact they're cursing.