Yeah I'm not even joking I managed to hit 4.5k views on a video and it's part 16 of a series I started 4 years ago. Don't get me wrong I'm still excited about 4.5k views on any video but why part 16?
Regarding the question i sometimes have the same thing were Episodes later on in a certain series score better then others. This could be due to gaining more vieuwers the further you progress. A other thing that probably counts towards is what content contains an episode, sometimes a certain chapter or part of something is more populair then others.