The levels that have the jelly beans will blink when u look at ur map. you can go as far back as the 2nd episode and replay those levels to add to the candy bowl....
They havent caught the stories up with the levels yet...And soon you will find that the mystery quests are not at the end of the episodes the closer u get to the end. But if yout do get to the end and stay there they will automatically advance u so you don't have to wait or ask friends