Question: Was the script for the sixth season written before this show was cancelled?
Question: How accurate are the science lessons on the show?
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.
Answer: Yes. Many things that would have been in the sixth season would have had Norman Osborne returning from limbo and reclaiming the title of the Green Goblin, Richard Fisk, the son of "The Kingpin" Wilson Fisk would return as a crime lord known as "The Rose", Ghost Rider would have appeared to help Spider-Man stop Dormammu from returning to Earth and Madame Web and Spider-Man would rescue Mary Jane from limbo.