https://www.yahoo.com/entertainment/jerry-mathers-leave-it-to-beaver-still-the-beaver-cleavers-143335922.html

The child star shares behind the scenes stories from the Cleaver family home.

Here's another interview, this time by John Cato:

https://www.youtube.com/watch?v=nM6SCcym-zg

Mathers almost always screws up on his trivia. This time, in an early-in-the-interview discussion about his green hat, he says he wore it in all six seasons.

In reality, he quit wearing it sometime in season five. The likely reason? He outgrew it.