Despite having a copyright of 1976, the dates and days of the week on the calendars shown during the new year song actually correspond to the calendar from 1973.
The calendar page sail on the boat with which Rudolph sails through the Archipelago of Last Years is labeled as "August 1928," but the calendar page is November 1928.
Rudolph: Aw, now don't get upset because I laughed. I couldn't help myself. Those ears made me feel so wonderful that all the happiness inside me just - just had to pop out. Same way with everybody else. Those ears, why they make folks... happy.