I ran movie theaters for about 10 years from 94 - 04. It is pretty common after a few weeks of a kids show being out to only play it during the day and play a more adult film for the later showings.
We had a huge daycare group come in to see pokemon the movie in the morning and the projectionist started Eye of the beholder instead... and then took lunch and didnt tell anyone he was leaving. What a clustered mess to clean up. Watch the first 5 - 10 minutes of Eye of the beholder to see why...