Aunt Bee bought a wig as she believed it would be convenient to wear at times, and even though Andy was not in support of her decision, he did try to help her conceal her secret from a visiting pastor that Aunt Bee was trying to impress. However, Opie, and his big mouth made it nearly impossible for Andy to pull off keeping Aunt Bee's wig a secret. Opie also opens his big mouth numerous times in the later episodes, which I found very annoying!