The Giuoco Piano Affair - S1-E7
Trivia: Four of the guests at Marion's party are played by U.N.C.L.E. production staff in cameo roles. Creator-producer Norman Felton is the man playing chess, producer Sam Rolfe is the dancing Texan, associate producer/writer Joseph Calvelli is the writer typing at the coffee table, and director Richard Donner is the drunk in the extremely loud sport coat.
Answer: He must have ridden in an Eaton's store elevator while he was in Canada at some point. For some reason, this elevator reminds him of it. The show's original concept had Solo being a Canadian, so this may be a minor nod to that fact.
raywest ★