I love Holiday Inn (film)
and some of the other older movies; a "feel good" movie. I just looked up the film and read the below. I guess I just never paid attention or connected what that part in the film meant.
Many segments of the film are preceded by shots of a calendar with a visual symbol of the given holiday. For November, an animated turkey is shown running back and forth between the third and fourth Thursdays, finally shrugging its shoulders in confusion. This is a satirical reference to the "Franksgiving" controversy sparked in 1939 and 1940 when President Franklin D. Roosevelt tried to expand the Christmas shopping season by declaring Thanksgiving a week earlier than his predecessors. The dispute led to the date of Thanksgiving being established by law rather than by presidential declaration.
Dean Martin & Martina McBride - Baby It's Cold Outside (With Lyrics)