Factual error: While the hospital did sustain some damage during the actual battle at Pearl Harbor, the Japanese forces did not deliberately target or fire upon it. Hospitals are usually avoided in battles as the people within are not in any condition to fight back and it would just be consuming ammunition that would be needed for attacking more practical targets such as enemy aircraft, assault vehicles, weapon repositories, and such.
Factual error: The USS Hornet, a Yorktown-class aircraft carrier launched in 1940, is played by a much more modern Kitty Hawk-class carrier. The B-25s also take off from a steel deck instead of a historically accurate wooden deck.
Factual error: As the RAF aircrew are running for their aircraft during the scramble sequence, one of the Spitfires can be seen showing a serial of 'AR4474' briefly. This is incorrect not only for a wartime Spitfire, but is completely out of sequence for any UK military aircraft. All four flying Spitfires used during filming had similar inaccurate serials. (00:38:20)
Factual error: During the attack on Pearl Harbor Danny and Rafe take off from an airfield and then fly to defend battleship row. As they fly over the harbor there are several Newport Class LSTs shown at anchor. This type of ship did not exist until 1966.
Factual error: When Ben Affleck is about to ditch his B-25 in China, and yells that the #1 engine is out, the port engine is shown spinning to a stop, with the propeller already feathered. A perfectly functioning engine would not have its propeller feathered; the pilot would feather it only after the engine stopped, to reduce drag.
Factual error: In the RAF squadron scene, the lined up Spitfires are the wrong mark for the period. For early 1941, the correct mark would have been a mark V. The Spitfires are later, as they have six exhaust outlets per side, and several have four-bladed propellers, neither feature being present on mark V Spitfires.
Answer: He is in the scene where the smaller air-base is being attacked by the japanese. You have to look really closely but he is the driver of one of the jeeps right before the japanese bomb drops (the one that seems to be a dud and then explodes). Also, Matt seems to be one of the gunners on one of the first ships at Pearl Harbor to return fire (this is not verified but in slo-mo, one of the gunners seems to be him).