Read the book before you see the movie. Like every other book-based film, the book is superior. Still, the movie did an excellent job of portraying how the men dealt with their experiences on the island on a daily basis through the flashbacks.
I feel like the film didn't do a very good job of explaining Harlon Block's role. Besides Ira Hayes visiting his parents, and his mom recognizing him just by looking at his rear, they didn't do a whole lot with him.
If you read the book, you find out what the Japanese did to Iggy. Pretty gruesome. I'm glad they didn't show it in the film.
My favorite scene was when Ira met Sgt. Strank's mother for the first time after the war, and just broke down in her arms. I'll admit, I shed a tear.