Ray Walston can be glimpsed briefly -- wearing sunglasses -- in the shattered remnants of the mirror that breaks when Tim smiles at himself. The reason he does so is that Walston almost always wore sunglasses any time he was not on camera (whether on the set or outdoors) because his eyes were extremely sensitive to light.
Title is based on the 1902 song "(Won't You Come Home) Bill Bailey".
Mikki Jamison, who played Debbie, went on to play Officer Jim Reed's wife, Jean, in the TV series "Adam-12".