I cry foul, but is that foul too?

I'm reading someone's book, which includes a story about a childhood trauma. But here's the thing: I'm doubting the memory before I even finish reading the account, because of the person's clothes. The person claims to be wearing a hand-me-down (because someone had grown out of it) t-shirt that commemorated something that had happened only a few months before.
(A parallel would be wearing a hand-me-down 9/11 "These colors don't run" shirt in December of 2001. But wouldn't the person who originally owned the shirt have bought the correct size, removing the need to hand down a t-shirt because of a growth spurt?)
Interestingly, I also have one of these incorrect memories. I have avoided the song "Baker Street" for years, because I'm convinced that it was playing when I was told about my dad's death in January 1978. I've remembered where I was (the living room), and the song, but here's the thing: the song wasn't released until February, which makes this memory less likely to be true.
Then again, I didn't publish my false memory.
But do incorrectly-remembered details mean the memory is essentially untrue? I'm inclined to think that at least some of it happened - certainly, my dad is dead, and this childhood trauma probably happened to this person in some way similar to the memory. But if one remembers some of it wrong, where do the errors stop?
And on a possibly unrelated note: how on earth does a PhD in a non-related field qualify one to write online articles for Psychology Today? Shame on you, PT.