Other mistake: When Alfalfa takes some flowers to Darla, Waldo (the rich boy) turns up and Darla's friends comment on the rich kid. As one girl is saying her line, 'He's smoother than a baby's bottom' you can see the girl next to her mouthing the same line.
Other mistake: 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.
Answer: Because MGM owned the rights to the "Our Gang" trademark, when the early films were re-released and new series started, the name was switched to "The Little Rascals" (for example, the 1982 cartoon) and that's what most people know them by. After that, it gets tricky with which companies own which rights, and King World Productions has some of "The Little Rascals" distribution rights.
Bishop73