I began my Lucy-Desi experience with the Havana themed episode loaded with guest stars: Ann Sothern, Rudy Vallee, Cesar Romero. I enjoyed Cesar's performance a lot, and it was nice to see Ann Sothern again even though she was really starting to get heavy at this time and had her weight camouflaged by black dresses and having rails and flower pots and tables placed at her waist level.
I've never been an admirer of Rudy Vallee, and by 1957, I don't think he was exactly in the top tier of stars any more and hadn't been for at least 10 years. Too bad Lucy/Desi couldn't have gotten Xavier Cugat for that spot, or anyone with something of a musical career still going at that point.
With the increased clarity of these shows (and they look fabulous, by the way), you can see bad paint jobs on some of the sets, and the backdrops are all too obvious now.