hi,
i don't know where i heard this but was there an episode where willis was beat up by a gang and got put in the hospital, from trying to protect arnold or something. did an episode like this ever exist?

Yes it was crime story ep

It was actually two older teens who were harrassing Arnold and Dudley for their lunch money. When Willis tried to defend his little brother, he was beat up and hospitalized. It was a 2 part story.