Potter mentions the US Army had recently banned the use of curare for medical units. The US Army never approved the use of curare in the first place.
The Canadian unit is stated to be the Second Battalion, Princess Patricia's Light Infantry. An infantry unit would not have curare, a surgical anesthetic.
Before getting the French wine, Klinger has an encounter with the company clerk from a Canadian unit who teases him by reminding him that the Montreal Royals always beat the Toledo Mud Hens. This would be impossible considering that the team played in rival triple A leagues (the Royals in the International League, and the Mud Hens were at the time in the American Association) and never faced each other in a regular or post season game.
Klinger tells the departing Canadian clerk to "drive careful" however he should have said to "drive carefully" since he needed an adverb to modify the verb.