One of the ways I incorporate technology in my preschool classroom is by showing fun videos at the end of the day. Now, these videos serve multiple purposes. They can be educational for the kids putting the topic we are studying into a "real" world application. They are also an opportunity for all of our students and classes to come together at the end of the day. We also use this time to clean up the classrooms and pickups are easy with all the kids ready to go in one spot.
I've had a hard time in the past finding videos to match our themes, though. It is really annoying because I don't like to watch shows in class unless they serve a purpose. So when I couldn't find a list anywhere online I thought I'd go ahead and do the research for you. Hope this helps you as much as it has helped us.
Without further ado, here is a list of popular children's cartoon episodes that are fall-themed, covering things like Back to School, Apples, Fall Leaves, Pumpkins, Fall Festival, Halloween, Trick or Treating, Bats, Thanksgiving, etc.