I believe many memoirs, especially ones that focus on early life, get “enhanced” to push the drama or humor. When you call something a memoir, you are literally saying it’s what you recall and not what a camera would have recorded and when we look at all the research showing how malleable memory it’s apparent some dubiously true material will work it’s way in.

With all that said, I think it would be more honest to change the characters’ names and call some of the “wild childhood” memoirs autobiographical novels, but there has typically been a more robust market for memoirs.