The title is from the common expression "A place for everything and everything in its place".
This is the first of three appearances Douglas Fowley makes in the series, and the only time he appears while Lassie is still on the farm. His roles are different each time. The other two appearances occur much later in the series, in season 17 and 19, i.e. Flock of Love (1970) and A Taste of Freedom (1972), respectively. TV audiences watching this episode of Lassie (1954), which aired on Sundays, would have perhaps recognized him as a regular on the TV western series The Life and Legend of Wyatt Earp (1955), which also aired during the latter half of the 1950s on a Tuesday. He played multiple roles in that series, but most often that of Doc Holliday.
Douglas Fowley plays Deputy Constable Purdy Timmons in this episode. Ellen mentions Constable Clay Horton, whose recurring role is played by Richard Garland multiple times in seasons one and two, but only once in season three, i.e. Transfusion (1956) and once in season four, i.e. Transition (1957), in the episode when the Martins take over the farm from the Millers. His character then disappears altogether from the series.