I know nothing about the books or the series, but it was just some people riding around and not falling off cliffs or out of castles to me. I don't think there's much in the way of spoilers in there unless you're only halfway through or something.
Am I missing something? How are you a couple books in and that was a spoiler?
Hm. Seems we need a new term. Spoilers tend to be things that people see, and immediately go "OMG WHY DID YOU SHOW ME THAT". This is closer to "huh. dragons.". Maybe "fridge horror"[1] is the closest? A "fridge spoiler"?
[1]: http://tvtropes.org/pmwiki/pmwiki.php/Main/FridgeHorror