Continuity mistake: When Carmen and Juni change from their uniforms to casual clothes in the store, Carmen is wearing a 3/4 length sleeved red top and a black jacket with matching cropped trousers, which she continues to wear up until they're at Machete's. But later on, when she and Juni ditch their wetsuits at Floop's castle, she's suddenly got a different top on.
Continuity mistake: When the kids are being chased in the Super Guppy, Carmen's school socks are at different heights in various shots.
Answer: When he told her that he knew about her still wearing diapers. He did it to get back at her for being so mean to him and they decided to call it even.