Quite a bit of footage is not appropriately dated for the sequence that its shown. Also a good bit is "colorized" a'la Ted Turner and not real original color film.
For things that are just "wrong", of particular note are the Pearl Harbor Japanese carrier shots used in the Marianas Turkey Shoot sequence, and 1943 B17 footage shown in the 6 June 1944 sequence. Its OK viewing but its not of exact historical accuracy. Beware!