Yeah...
Well, One way to get the file size down is to change the way you are making this series. It appears the whole thing is just a giant avi file. Try splitting things up, reusing some sections. Considering the majority of the episode was just chattering in one place, you could easily have made a high quality clip loop every few seconds.
Other than the file size, the movie was boring. Get the file size to an all time low, and cram in a bunch more things at once. Then make a scene selector so people can skip to the good stuff.