Board Thread:Spoilers!/@comment-6208134-20130130185920/@comment-5106672-20130320230647

I kept thinking about that and my best guess is that the curse is kind of able to "adjust" to the current situation, or the alterations made by non-cursed people. Which is, Regina's actions, outsiders' presence and possibly also the time of the year (I strongly doubt they'd wear coats in summer). Perhaps the little variations such as clothing, or Henry being able to learn, were given by the "interaction" of the curse with these different occourrences.

Also, I remember reading somewhere that supplies were delivered to the town from outside: do I remember correctly? Because in that case, that could have "moified" some days in the loop as well.