When Michael talks about selling booze in North America, he talks about prohibition in Canada... Canada never had prohibition. As a matter of fact, a lot of contraband alcohol in the U.S.A. came from Canada, where production and selling was legal.
Thomas and his secretary refer to Michael's job as 'accounts clerk' but both pronounce it the American way, 'clurk' instead of the English pronunciation 'clark'.
When Thomas makes his speech about selling alcohol to the rich people of [North] America, he mentions New York, Boston and Toronto. Of course, Toronto is the actual biggest city in Canada, but this was not the case in the 1920s. In that time, Thomas would have mentioned Montréal. This was indeed the place to be. So much so, that it was where the Bronfmans (Seagram), who were also starting their alcohol business at the same moment, established themselves.