During the segment "Caillou the Firefighter," Caillou and Leo agree to take turns wearing Caillou's firefighter's hat. At one point, when the fire alarm is being tested, both Caillou and Leo are seen wearing firefighter's hats. When the "camera angle" changes again, Leo is no longer wearing one. The same mistake is made later when the dog, Sparky, bounds up to Caillou and Leo. This time, only Leo should be wearing a hat, but instead both he and Caillou are.