Curly briefly speaks in his normal voice when he asks Larry to take a candid camera photo of the prince, while Curly "peddles" the lemonade.
During the filming of this short, Curly Howard suffered one of his first "small strokes". This is evident in the opening outdoor sequence in which Curly's face looks worn and his voice sounds scratchy. However, the reason why Curly appears more lively in the follow-up sequences is because the opening outdoor sequence was filmed last. All of the other sequences were filmed on sets, prior to his early stroke.