I don't see that happening since Rosie sacrificed herself to save everyone from the nightmare queen, and plus she has turned into stone. Even if she came back, it would ruin the entire reason why she sacrificed herself, and it won't make sense since we saw Rosie's memorial at the end
Ok there are things wrong. 1st. Boris's voice is Eric, not Brian. 2nd. Caillou's voice is David or Ivy, not Paul. 3rd. Why dis Caillou's voice change when he became fat? 4th. His shirt changed after he became fat. And 5th. That blur effect at the end isn't a real effect to use in GoAnimate.