Glynnis Johns (Jo Eunson) and Reta Shaw (Mrs. Runyon) would play characters more friendly to each other in "Mary Poppins," (1964) as 'Mrs. Banks' and one of Mrs. Banks' domestics, respectively.
Twin brothers, Mark Easton and Paul Easton played twin infants in the movie. They were born in Los Angeles, California on Wednesday, February 29th, 1956.
As young Robbie leaves his house for the last time, the camera angle reveals the snowy backdrop to be on a sound stage as the catwalk is seen clearly for a second or two.