You know what the Ninjago movie could've done? So you know the part where all the ninja are in the temple of fragile land, (Or whatever its name was) and Jay starts spinning really fast? They could've had ALL of them unlock spinjitzu, and because we know they didn't watch the show, (Kinda obvious), they could've had everybody from the tornado of creation!
Then the new fans would be all like, "OMG THAT WAS SO COOL!" And all the old fans would be like, "OMG THROWBACK TO THE PILOT EPISODES!!!" Just saying that would've been cool...