The guy that made the pumpkin started with one of those foam pumpkins you can buy so it won’t rot and there is no scooping of pumpkin guts to be done. After cutting a hole in the back of the fake pumpkin, he crammed some LEDs into the front of the pumpkin in patterns that will allow multiple facial expressions.
All those LEDs were then wired to a controller board with a power source that would change the expression. I will say the pumpkin looks kind of bad in the daylight, but at night, it looks fantastic. Check out the video below to see it in action.