Yet another question about the Simpsons

In the episode 'King Sized Homer' there's a series of events I don't quite understand. After Homer has spent a few days as a fat guy on disability, doing his job by hitting a Y key over and over again on a remote terminal, everyone has become fed up with his girth.

Bart and Lisa come home from school to find Homer skipping work to catch a movie. After his negligence seems as if it's going to lead to a catastrophe, he has to rush back to work - hijacking an ice cream truck along the way. While driving the truck, he passes this school bus-

Which for some reason contains Lisa and Ralph-

Despite a scene set more than an hour previous taking place after school that day.

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