Originally a one hour long episode but broken into 2 parts for syndication.
In this episode, Mr. Drummond celebrates with the boys that they have lived with him for 56 days. This episode was originally aired on December 29th, 1978. 56 days before December 29th is November 3rd, the actual day of the series premiere of Diff'rent Strokes.
Arnold says his catch phrase "Whatchoo talkin bout!?" twice in this episode--once to Willis and once to Kimberly.