Barney's 2nd misfire of his gun occurs in this episode.
The calendar in the jail cell behind Dan Caldwell shows a month with 30 days in it. The calendar has the 1st on a Sunday and the 30th on a Monday. The calendar had to be from November 1959, because there were no months with 30 days that started on a Sunday and ended on Monday for 1960 or 1961. November 1959 was the last month, before this episode aired, that had 30 days in it that the 1st was on a Sunday and the 30th was on a Monday.