Topic on Talk:Unintentional Period Piece

"[T]his trope only really applies to works that wear their dates so blatantly that a viewer can identify the era or even year it was made in as soon as they begin to watch it."

So everything that looks dated can be included as an example, as long as it's undeniably from their time.

But then the article mentions before that: "While just about every work becomes somewhat of a period piece after it becomes more than a decade old due to the characters referencing old trends, wearing out of style fashions and using out of date technology, [...]"

I see a contradiction between what the trope is and what most examples describe.