Excluding obvious tech stuff like mobile phones, Alexa etc. I'll start:
Olives - we always have at least 2 kinds, my mother would have thought they were poisonous berries
Cat tree/electronic cat toys - one did not provide entertainment for cats when I was growing up! Ours have more stuff than the kids 
Different oils - extra virgin olive for salads etc, sesame, sunflower. I don't remember mine actually having any, she didn't really cook with oil
Trainer socks - one of my DC will ony wear these. My mother would have been utterly confused about socks which stop at the top of the foot and leave your ankles bare. She was obsessed with pulling your socks up and not getting cold ankles
Sour cream - I seem to get through so much of this for various things. She would have wrinkled her nose and thrown it out!