Did the Harry Potter supplemental books contain clues relating to the main storyline?

In Who Killed Albus Dumbledore?, Wendy B. Harte says:

The [Black Family] Tree is an important secondary septology resource, much like Jo's [Rowling] Fantastic Beasts and Where to Find Them, and Quiddich Through the Ages. Both books contain many series clues, and both were written for charity.

I always assumed that these two books were devoid of any material pertinent to the main Potter storyline, and (to be blunt) just aimed at getting a few more million dollars from the Potter fans, especially (the parents of) the youngest ones.

Since the conclusion of the Potter storyline is known now (unlike when Who Killed was published), was this supposition (that the books contain clues) correct? If so, what clues were in these two books that were not also found in the main Harry Potter books?

The Tales of Beedle the Bard was published after Deathly Hallows, so it wouldn't have contained clues (since all mysteries were revealed). Did it likewise answer questions not resolved in the final main Potter book?

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