The Lucy-Desi Comedy Hour (1957)'s eighth episode, Lucy Goes to Alaska (1959) is the only episode of thirteen, that "Little Ricky Ricardo" actor, Richard Keith did not act in. Richard Keith was in the other 12 episodes.
At the time this episode was aired Alaska had on been a state for about a month, gaining it on January 3rd, 1959. Fred Mertz states that before they admit Hawaii as the 50th state they need to make sure they have enough hotel rooms. Hawaii's statehood was largely anticipated and would occur in August of 1959. Thus for a short while the United States had only 49 states and would have a flag reflecting that.