Climb the Greasy Pole: Part 1

When Charley looks at the calendar in the kitchen, it shows the month of October, 1959. The days corresponding to the dates are, however, wrong. On it the date Monday the 30th is circled, but in 1959, the 30th of October was a Friday. One would think that the producers of shows like these would not make such a rudimentary mistake, when, even back when this was made, it would not have been that difficult to look up a proper 1959 calendar. One thing can be said, is that this date is consistent with the timeline of previous episodes leading up to, although the show in general does have an overall inconsistent chronology.