The My Friend, the Gorilla Affair - S3-E14
Revealing mistake: The snake encountered by the prisoners is initially black with white markings (a stock shot). But when Illya kicks it aside, it has somehow turned solid gray. It's also very obviously made of rubber. (00:07:25)
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 ★