Dennis Haysbert was shuttling back and forth from the east coast to Los Angeles during the production of this movie, because of his commitment to TV show 24 (2001), that was filming at the same time.
In January 1958 (when she could reasonably be expected to be reading the latest January or February issue), Cathy reads an August 1957 issue of Cosmopolitan (Polly Bergen cover) that hit stands a half year earlier.