-- Incidentally, I saw a Magical Thinking Romance Theater t-shirt once. It read
Before he wines and dines you
Before he falls madly in love with you
Before he marries you
Before you have his children
Before you grow old together
He actually has to call you.
That's a not-unfamiliar phenomenon -- you never notice some specific thing, and then suddenly, they're everywhere.
Well, here's the equivalent phenomenon in romance novels. If you're reading all of a specific author -- in my case, Lynn Kerstan, whom I love -- you may notice something that is in every book. It could be an expression that a character in each book uses, or a description of the geography that recurs. Or, in the case of Ms. Kerstan, it is a gesture that every heroine makes. In every single one of Ms. Kerstan's short-form Regencies (for Signet, I believe), there comes a point of high drama in the dealings between the hero and heroine when she will grab her skirt in both fists. And the gesture is always described the same exact way. And once you see the trend, you can't help looking for it to recur in every single book. It becomes a bit like spotting Waldo!
You know how that could happen. For the author, it's an almost-Pavlovian response: Protagonists having tense discussion? Heroine grabs skirt in both fists . . . . NOW. I would imagine it's hard to spot for the author, who may be the last person to read her own works in order, one right after the other. On the contrary, she reads them with a year or so between each book -- and may never re-read them after publication.
The moral is not that authors should re-read their books to look for the Yellow Corvair phenomenon. No, I think the answer is more simple: Any reader devouring an author's backlist in quick succession assumes the risk of seeing the Yellow Corvair in that author's work. It's the downside of reading one author too fast, a bit like getting brain freeze when eating ice cream.