Perhaps the most common and most easily accepted type of mandela effect are subtle changes in names of famous (and likely, non-famous) people, logos, and the spelling of certain words.
Well known examples are the missing dash in Kit-Kat, the new loop in the Ford logo, the missing circles on the Target logo, and the spelling of the Berenstein Bears, FruitLoops, Sex in the City, Kate Perry, and Looney Toons.
An extra letter here, one less there, a change in font, these small changes are effectively insignificant. They don’t make much of a difference in the world. Yet, they stand out to people exactly because they are so common and widespread that people known them well, and they manage to catch people’s attention without provoking fear. They are small little wake-up calls that serve to awaken people enough to start smelling the coffee.