Well said Witchfan, RK07 doesn't know what foreshadowing is. He makes tons of them but they act like back doors he could use to alter the story if he wants. By the end all of the herrings need to be explained, thats what makes them herrings instead of back doors. Its the trust you have with the author that you know that they will be locked and that only one possible truth will remain.
RK took the easy way out, he explained some of them, the ones he could. Then decided to tell you that all the doors are locked when you could still see a lot of them wide open. You could tell him that "hey some doors are still open
" he'll just answer "No there aren't, in fact there weren't any doors to begin with"
e- I've looked at the code, I really cant see anything that points to an alternate ending right now. The most I can see is possibility of a patch that gives more quizzes to bring the number of coins up to the theoretical maximum written of 30 coins.