Nah, they are still petals, just the flag is flowing in the wind so it seems a bit distorted.>>13289620
the whole movie is a sort of alternate reality "WHAT IF?"
What if Chopper didn't join during Alabasta, but say after the Straw Hats left Water 7 with Robin, Franky and the Sunny they arrive at Drum. The film shows this. Sure it may not be canon, but its still pretty faithful in the flashback and such.