First episode with William Demarest as Uncle Charley.
Before joining this show, in its fifth season in 1965, William Demarest had supported lead actor Fred MacMurray in six films, dating from 1935 through 1963.
When Chip asks Charley if he was in the Navy, Charley says that Chip had better call him Uncle Charley. But Chip had addressed him as Uncle Charley when he asked the question.