I had a problem going to the movies with my first pregnancy. Haven't gone yet with this one to know if it'll have the same effect. But i ended up getting horrible spasms in my stomach from sitting in the same position for so long. So make sure you bring a pillow or something to keep yourself comfortable if you can.
Lol nope. I've seen SO many movies with my baby at all stages inside me. I'm a massive Transformers fan and plan on going to the premier as well. I have never noticed that the noise bothers him, if anything I think he gets excited. I'm actually 10 days till my due date, and hoping my boy will pop during the movie. :) Truely be a nerd child.
From what I know it's fine. I will be seeing the movie too at 27weeks. The baby might get startle at loud sounds close to your belly but as u said the most is him moving around some or maybe not all all! Have fun at the movies!!!