Continuity mistake: The wall separating the cockpit of Goldfinger's private plane seems to have disappeared when Mai Ling is waiting for Bond to lower the steps of the plane as she can be seen standing right behind Ms. Galore's seat.
Factual error: A crushed Lincoln would be too heavy for a Ford Falcon Ranchero to haul. (01:22:05)
Chosen answer: They're not. Q was just indicating to Bond that these were the wing machine guns, he wasn't stating which was which.