Clearing up confusion about this film
In 1965, "Oggi, domani, dopodomani" was released in Italy as a 3-part film, the first of which was the Ferreri-directed segment with Mastroianni and Catherine Spaak. Segment two featured Mastroianni and Virna Lisi, while segment three featured Mastroianni and Pamela Tiffin.
In 1968, segments two and three from the original film were released in the U.S. as "Kiss the Other Sheik" and DID NOT include the Mastroianni/Spaak segment. IMDB's listing here is confusing and incorrect.
Also in 1968, the Mastroianni/Spaak segment from "Oggi, domani, dopodomani" was released in an expanded form as a stand-alone film in the U.S. under the title "The Man With the Balloons." Outside of the U.S. and Canada, the expanded version was released through MGM under the title "Break-Up."
Finally, the short version of the Mastroianni/Spaak segment is not merely a trimmed down version of the stand-alone film. It contains some footage not included in the extended version.