This was not an original screenplay for The Twilight Zone (1959). It's a remake of The Incredible World of Horace Ford (1955), which was a live TV version starring Art Carney and Jason Robards.
The blueprints of Harold's new robot toy are copies of the actual blueprints Bob Kinoshita made for the design of Robbie the Robot in Forbidden Planet.
This episode revisits themes used in Walking Distance (1959) and The Trouble with Templeton (1960) - namely, a person's propensity to romanticize and try to relive a past that may not have been at all as good as they like to remember it.
The same footage of his boyhood scene was reused twice, additionally with close-ups of his reaction edited-in.
Pat Hingle and Nan Martin, who played Horace and Laura Ford, reunited the following year to play husband and wife Mike and Pauline Decker on Search in a Windy City (1964).