In Alicorn's Shadow, while trying to solve a riddle about the stars, Daring lists all of the possible constellations visible during the spring equinox but she apparently leaves out one - the dragon. At first, fans thought it was just a mistake. However, after the release of Legacy of Nightmare Moon, it takes on a whole new meaning. The Dragon constellation didn't exist yet in the Daring Do universe because Inti becomes it at the end of Legacy of Nightmare Moon
The final chapters of Cove of Candles and the truth behind Blackmanes curse imply that the entire middle third of the book(from Daring's arrival at the Secret Shipyard to Ahuizotl's appearance) took place wholly in Daring's mind. Furthermore, the implications that Blackmanes crew is composed almost ENTIRELY of ponies that had come in search of the treasure previously, and that Daring was VERY close to taking Blackmane up on his offer to 'join the crew'.
Precisely how long has The Wooden Mask been around?
How many ponies had Sweeney Trot gotten to before Storm Talon found him out?
Why would the deathtrap room in the first volume have the activation lever on the inside of the trap, other than to provide Daring with an opportunity to escape? It's pretty obvious that placing it outside the door would have been fatal to the hero.
Maybe so whoever uses it can make sure it works.
So the victim would struggle, making their demise all the more horrifying.
Perhaps it was a test, of the nature that if somepony escaped the trap, they were innocent
