It would be great to have a check icon next to the season number header to indicate when the season contains all episodes. This comes in handy for those not familiar with the show and how many episodes are typically in a season of said show.
This would kind of look like the "Verified" button on social media websites. Perhaps there would be a tooltip that would explain what the icon meant when the cursor was hovered over it.
See mockup image:
Normal:
On Hover:
