The first appearance of Data's emotion chip. It will change size, shape and installation location throughout the series, until it becomes a large 1 inch square that fits into the top of Data's head in Star Trek: Generations.
The interior and components of a combadge are seen for the first time when Dr. Soong adjusts Data's. The top and bottom sections are connected by a hinge on the (wearer's) left side. Among the interior components is a red light.
In a re-use of prop lighting, Dr. Soong turns out to have the exact same model of wall fixture as Kivas Fajo had in his gallery room in "The Most Toys". The design apparently uses dichroic filters, as we see two pairs of colors and their complements being produced from the upward pointing white light source.
Comic book artists Jerome K. Moore and Arne Starr met Spiner on set during the filming of this episode. Starr presented Spiner with a caricature of Spiner as Superman, titled "The Man of Shlameel." Written on it was the phrase "It's a bird, it's a plane, no... It's Spinerman!" Spiner reportedly kept the picture on his desk in his office for many years, so Starr was told.
The emotion chip stolen by Lore is a major plot device in the TNG two-part episode "Descent" and a minor plot device in the movies Star Trek Generations, Star Trek: First Contact, and Star Trek: Insurrection. It is also referenced in the TNG episode "Inheritance".
The song which Lore sings to Dr. Soong comes from the poem Abdul Abulbul Amir, written by William Percy French in 1877. That poem has been frequently misquoted and parodied, and the excerpts in this episode are also not accurate to the original text.
James Lashly portrayed two different Starfleet officers in episodes of Star Trek: The Next Generation and Star Trek: Deep Space Nine. He played Lt. George Primmin in DS9: "The Passanger" and DS9: "Move Along Home" as well as Ensign Kopf in TNG: "Brothers".