Like Fat Albert, Bill is usually the voice of reason in the gang, although at times a little more stubborn. As the older brother of Russell, he is often trying to keep his little brother Russell out of trouble - though not always successfully.
- Bill is based on the series creator Bill Cosby.
- Bill's brother Russell, is based on Bill Cosby's real-life younger brother, Russell Cosby.
- On the series Bill has a white shirt but on the movie he has a blue shirt. On the series Bill has white all stars but in the movie he is wearing black all stars.