1) A moment with Igneel and little Natsu. What is this moment about? To whom pulls the hands a little Natsu?
- The Igneel/Natsu moment was shown at the very beginning of the movie, it was a very short flashback, where Natsu found Igneel in a cave, and was astonished by Igneel's fire magic.
2) Why Happy is red color and why he can used fire magic?
- Happy ate a weird mushroom? and his skin turned red afterwards, and he was able to spit out fire. This ability allowed Happy to knock out Zash' malicious dog

The effects ran out as soon as he spat out fire.
3) Why Natsu have been half-dragonized?
- END partial transformation, triggered by the fact that he was being overpowered by Animus.
4) What Lucy and Natsu say, looking at the starry sky?
- The Stella Kingdom is known to have the most beautiful night sky in the Fairy Tail world. She wanted to see it, so Natsu made her climb up to the top of the tree to see the elegant views of the starry sky.
They are talking in this moment?
Please! Anyone can answer me to these questions? I will be grateful for help.