[August]

1) Porche and Krupp

2) Wide tracks suitable for mushy ground

3) Beats me

4) "Das Reich" didn't enter the Normandy fighting until a month later and then they went into action against the Brits at Caan not against the Americans to the west.
Hitting the bottom of a mortar round on a hard surface does not turn it into a grenade.
Telephones didn't have coiled handset cords in the 1940's.
Jackson sniper rifle had a Unertl scope. Those ere only issued to the Marines in the pacific.
The bridge was an 82nd objective not the 101st's.
The "Tiger" tanks had what looked like T-34 road wheels.
There were no Tigers in the American sectors.

5) Dunno

6) Trick question. WW2 was way too large to have a single "most decisive" battle and there are several others which had more impact on their respective theaters than the ones listed. Saipan, Stalingrad, Overlord, El Alemain come to mind.