I can get to the bottom of the hay maze and the top easily enough, but how on earth do I get to the middle section with the wheat stacks? There's always a pumpkin there and it's driving me nuts not being able to get to it.

several of the festival zones, including the fall fest zone, have secret passages.
The cut-off section of the field area is accessed in this way.
Throughout the zone there are trees, fences, wheat, and rocks that are, in fact, an illusion- Look out for sections of wall where the arrows say you can, for some mysterious reason, walk into them!

(or you can cheat and check out Tori's map thread which has maps that show all the secret passages)

Oh, ok! Thank you XDD I was so confused and weirded out thinking I was missing something. Turns out I really was!