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Visible crew/equipment: When Alfalfa is being chased by the bullies, he dives into someone's pool and swims across. When he gets out, there's a shot of him standing there with the house behind him. A couple seconds later the dog starts barking at him. Behind the dog, leaning up against a wall, is the cardboard cutout of the house used in the previous shot.
Other: When Waldo and Darla are heading towards the go-cart race, as Waldo is phoning his dad, you can see that Darla is looking straight at the camera, then looks at the back of Waldo's head and keeps looking that way for the rest of the scene. It's obvious that Darla was not supposed to be looking at the camera, especially if you watch the ending credits, where people are telling her not to look at the camera.