343 Guilty Spark's single bulb is supposed to brighten whenever he speaks, as he does in Halo and Halo 3. However, in Halo 2 due to a bug the developers were unable to fix prior to launch, his bulb dims as he speaks.
In the level "Quarantine Zone," Miranda Keyes' hands are empty. When Johnson calls out for his marines, Miranda Keyes' hands surprisingly are holding two submachine guns even though we do not see her draw them out.
During the invasion of Earth, it shows several Covenant and human ships entering Earth directly over Africa to get to Africa. However, the angle is too steep that you would hit Earth directly and crash. The best way to get to Africa via space is to enter the atmosphere over South America at a safe angle.