By this point, you've surely understood how much this film meant to Steven Spielberg, and how obsessive he was about making it correctly. Everything was done in accordance with his vision for the production. It would take an exceptionally brave man to answer back to Spielberg and disagree with anything he was trying to do; which must make Tom Hanks an exceptionally brave man.
There's a memorable scene in the film where Hanks' character Captain Miller tells some of his troops what he does back at home. It's a window into the character's soul, and a reminder that every soldier we see has a real life away from the nightmare they've found themselves in. Hanks didn't agree with some of the script's dialogue, feeling that some of the details the character was supposed to reveal were inconsistent with what we'd already been told. Amazingly, Spielberg agreed, and allowed Hanks to give his own take on the tale instead.