This episode is a remake of It Takes One to Know One (1964), combined with elements of Ling Ling (1965) from the same season.
Prior to playing a cat in Bewitched, Julie Newmar played Catwoman in Batman.
In the opening scene, Samantha pulls out a blue & white checkered bag of Weber's bread from what looks like a microwave, but it's actually a bread box.
While Elizabeth Montgomery wears the brown dress in this episode, it's obvious that she is not wearing a bra. You can see her nipples poking through.