Yeah, that's what it's called ... The weird thing is that I apparently remember all of the examples as the other thing that's actually wrong. I would assume it would actually be 50/50. Perhaps it's possible for people to doubt themselves to the extent that they just pick the wrong answer as the answer they would probably give.

From a quick search:

Nelson Mandela: Broome and others falsely remembered Mandela dying in prison in the 1980s, even though he was released in 1990 and became president of South Africa in 1994.

C-3PO: Some people misremember C-3PO from Star Wars as being entirely golden.

Jiffy: Some people misremember Jiffy as the name of a peanut butter brand.

The Berenstein Bears: Some people misremember the spelling of the classic children's book as The Berenstein Bears.

Mr. Monopoly: Some people misremember Mr. Monopoly as wearing a monocle.

Pikachu: Some people misremember Pikachu's tail as having black tips, when it's actually yellow.

Mickey Mouse: Some people misremember Mickey Mouse as wearing suspenders, when he's actually wearing shorts.

Star Wars: The Empire Strikes Back: Some people misremember Darth Vader saying "Luke, I am your father" when he actually says "I am your father".