Righty, after thinking about this a bit:
- I'd say your target audience for this is very much the "silly stuff" side of the Internet. Have you tried Fark, Something Awful, 4Chan (I know, I know...), BoingBoing or Collegehumour?
- For submitting to anything vote-driven like Digg and the above sites, headline is all. I'd recommend brainstorming 20 or 30 headlines, and picking up a good copywriting book like "Tested Advertising Methods", as well as reading through all the headline tips on Copyblogger, before you start re-submitting. Submit your absolute best stuff, too - probably the trailer. If you can get a laugh in 20 seconds, you've got a good chance.
- A logline might really help you get past the 20-40 second hump. Currently when I arrive at the first episode, I know nothing but that it's about a monkey. I might not like monkeys - but I might love Team America-style 80s movie parodies. Let me know it's one of them in the description in YT! A description that makes me want to keep watching and lets me know what to expect will avoid me dropping out straight away ("WTF? I was told this was a puppet film but those guys are real people! I'm outta here!")
- On the Team America subject - I'd push the fact that it's a parody action movie with puppets - just like Team America - pretty hard. Maybe even change your subject line to include something like - "In the style of Team America" or "If you liked Team America, you'll like this". (Assuming that people who like Team America tend to like it, of course!). Also worth considering for headlines, as above. I've had quite a lot of success with linking my influences or similar-but-more-famous stuff to my work in headlines.
- This REALLY needs a trailer, and I couldn't find one online. What you want to do is to hook people with the hilarious action monkey hijinks to come, right from the start - that'll get them past the slightly flat acting (It's not bad, but let's face it, we're there for the monkey). You mention you've got one cut - I'd suggest linking to it at the start of every movie (via the YouTube annotation function).
- I'd also say that this really needs a website of its own. Currently you're being badly hamstrung by the YouTube interface - I can't find the trailer, I can't find any information on what this series is, I can't even easily find other episodes. A reasonably simple website would provide a great landing site, allow you to explain a bit more about the series and start building up supplementary material (like stills from the film - which you could then promote virally via sites like Reddit. People love a great still image).
You could also then use tracking codes in the website to track where people are stopping watching, which will allow you to optimise - particularly if you put the trailer front and center on the website. See
http://guerillashowrunner.com/2011/...hen-they-start-where-they-come-from-and-more/
Anyway, a few tips there - hope they're of use!