The color scheme of the train cars and train station match that of the interiors of nearly every room in Mayberry: light green and tan.
Millie will be the last of Howard's serious girlfriend prospects in the series. She was preceded by Irene Fairchild, the county nurse; Alice Harper, Andy's old girlfriend; and Betty Parker, Tommy's sister in the episode "Big Brother." After Millie, Howard will have trouble finding a date for his bachelor pad housewarming.
Throughout the series Goober is portrayed as the last person anyone would consult about human relations, yet he's the only one in the episode who's right about the ultimate compatibility of Howard and Millie.