Continuity mistake: When the class is in Arnold's esophagus, Tim says something, then it cuts back to Ms. Frizzle. Arnold is sitting in the back seat of the bus.
The Magic School Bus (1994)
Episode list - season 4
Starring: Lily Tomlin, Daniel DeSanto, Erica Luttrell, Tara Meyer
More mistakes in The Magic School Bus
Arnold: I knew I should've stayed home today.
Question: How accurate are the science lessons on the show?
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Answer: In general, quite accurate as that was the point of the show. To teach kids about science. As the show is now over 20 years old, some facts have changed as we're always discovering new things. For the time, it was as accurate as it could and much of it is still accurate now.
One thing I think the show gets wrong is the idea that electrons stop moving when you break a circuit. Electrons never stop moving.