I watched the movie on TV at my house. Loved every second of it. Mewtwo was a deep character who I felt bad for. The battles had a different feel to what I was used to.
The different pokeballs they used to catch the originals for cloning made me wonder if they would ever invent new ones for capturing pokemon.
Mewtwo and Mew's abilities throughout the film made me think that they had other abilities instead of normal pokemon moves. So they were special. Like mewtwo changing the weather and mind controlling nurse joy or Mew's bubbles.
When Ash turned to stone/died it made me realize how dangerous things could actually get.
Seeing many pokemon throughout the film was cool because I had seen so many throughout the journey and it made you realize how far you've come. Team rocket watching the cloning process on the display screen saying "Who's that pokemon" was a nice reference to the commercial break questions.
Ash trying to fightback against Mewtwo was one of the few times a human tried to seriously fight a pokemon, so it was an interesting rare sight.
Lastly, seeing all of the clones leave and everyone getting amnesia left me with this sense of sadness and hope. I felt bad for the clones, and hated the fact it was almost like it never happened, since no one would know. I thought ash and his friends could help them somehow. I was hopeful for their future and hoped they would meet again when the journey continued.