It is suggested to first clear the liquorice swirls then lucky candies, because the lucky candy can either spawn liquorice swirls or popcorn. If lucky candies do not spawn enough popcorn, it is impossible to complete the level.
This is the second level where the player must collect blockers which don't appear or spawn on the board normally, meaning that the player must rely on lucky candies. The first one is level 1611 (which required chocolate and liquorice swirls). This level requires popcorn (liquorice swirls must also be collected but they appear on the board normally).
This level spawns sugar drops, when that feature is active.