Question: Why do they still have gravity when Romilly asks Cooper to turn of the spinning, when they neared the wormhole? The centrifugal force stops, but on the inside there is still gravity.
Chosen answer: They do not still have gravity. Romilly is actually floating, but nothing is ever shown from behind his back, so the floating is gone unnoticed. In fact, during some shots of Romilly, you can see his feet floating behind him.
Question: In the beginning, Thomas wakes up in the Box which is moving up. He discovers an animal in the cage. It looks like a black pig. The pig apparently isn't shown anymore in the rest of the movie. Why the hell is the black pig in the Box?
Chosen answer: It is just part of the supplies that is sent up each month, along with a new boy. Everything the maze residents have has been supplied to them. That includes rudimentary tools, vegetable seeds, food, and various other supplies and equipment. The pig is just livestock that will likely be butchered for meat.
Question: Before leaving the plane, the doctor smirks, and after leaving he furtively looks back. He's supposedly an innocent, so why does he do this?
Answer: At no point is he shown smirking before leaving the plane. In the two shots he appears in before he is shown exiting, the first he is wearing an oxygen mask, and the second shows him straight-faced and helping someone to the front. The reason he looks back after going down the slide could simply just be to see who is coming behind him, or he could be examining the damage to the plane.
Question: Why does Colin Farrell's hair go from long to short in the "current day" part of this movie?
Answer: It wasn't his cell. He took Chrissie's cell.