Really good stuff.
+ I really liked the effects that went into particular scenes including Bill's demonic transformation.
+It was also well written.
-I suggest that you improve the audio quality voice overs. In certain parts of the animation, it was hard to determine what was said over the bad quality. It sounded like you had used a Noise Filter on a very high setting to be specific.
-Don't put warnings about the movie in the preloader. You should fix any problems you may think you have with the animation before you submit it.
-Certain parts of the animation weren't animated as well as they could have been. For example, Bill's walking loops were poor--especially the loop where he's walking away with his back to the camera. Moreover, the sun in the introduction of the flash should have slowly panned to the right rather than remaining static in the frame. The shaving scene was a nice touch, but foam was being removed in places that weren't even being shaved. It good to see that there wasn't one glaring error, but a collection of small ones is often times just as bad.
+Very nice character sketches. None of the characters looked alike and they each had their own personality. But you may want to be wary that Bill does not become a parallel of Homer Simpson.
+The crap scene was enjoyably disturbing.
Overall, this is an excellent animation, which shows a lot of effort and potential. The animation seems heavily influenced by The Simpsons and Family Guy, which isn't necessarily a bad thing, but I urge you to really use your talents to make Bill's Adventures your own unique work.