What's amazing about that episode is how it plays today. Little Cindy is getting picked on, and when the bully won't quit, Peter steps up and pops him one in the mouth, knocking a tooth out and giving the bully the same speech impediment Cindy had.
And then they all make friends and go home.
Didn't you think the bully kid had a lot of nerve to show up at the Brady house to borrow Cindy's tongue-twister book???? I mean, geez, go to the library....