I like the idea behind The Market, but I think the execution is poor. It would have been nice if the humans had actually noticed the rabbits before the part with the pig.
The Great Water? Um...seriously the bus leading to the exact part of the great [sic] water where

lived? That's rather unlikely. :calohki is a nice character, however.
Sometimes, I think it may have been a good idea to group all the filler episodes in one single episode. The Mysterious Visitors could have gone something like this:

I hear you wish to speak to the Chief Rabbit of this warren?
Visitors: Oh yes, could you please direct us to him?

You're speaking to him right now.
Visitors: Oh! Well we heard so many great things about you...

If you heard so much about me, surely you must know what I look like?
Visitors: They saw through our trick, RUN!

Oh how I would have loved to have them teach me how to fly!

Climb on, little Pipkin! You shall fly with me!
Moving on...
The Invasion, I have to say, I like it. While it may be the worst episode of the series, it's so bad it's good, with

teleporting among other things.