Revealing mistake: Laying in bed asleep, Lulu has a sucker swinging on a string to and from her mouth as she snores. When we first see her, after the sucker leaves her mouth the first time, her hair has a glitch. For a few frames, one loop of her hair vanishes, and then comes back. This repeats each time the sucker moves away from her. (00:00:45)
Revealing mistake: As Lulu is pulling her fishing pole out of the school steps, you see if you watch closely that the pole actually passes through the concrete of the steps rather than her lifting it over. (00:02:00)
Chosen answer: She writes "I'll never play hooky again."