In syndication, the series was entitled "Jeff's Collie" until Episode 4.13 Transition (1957), i.e. this episode, when the series became "Timmy and Lassie." During the original CBS network run, the series was entitled Lassie (1954).
Of the regulars in recurring roles for the seasons preceding this one, only cast members Florence Lake and Jon Provost continued with series beyond this the 4th season. Florence Lake's last appearance was in Lassie and the Tiger (1962) from the 8th season; Jon Provost's in The Wayfarers: Part 2 (1964) from the 11th season.
This is the fifth and final appearance Marjorie Bennett makes in the series. She appears each time as Birdie Brockway, Porky's mother.