When Detective Amaro tells Henry Mesner, "It's real good you did that," this refers to the same line used in "The Twilight Zone" (1959) It's a Good Life (1961) in which all the adults are so scared of Anthony Fremont (Bill Mumy), they continually praise him by telling him that his actions are "real good."
This was the 1,000th episode of the "Law & Order" franchise to air since the premiere of Law & Order (1990) on September 13, 1990.
When Henry is holding the gun, he's obviously squeezing the trigger the whole time.
References the short story "It's a Good Life" by Jerome Bixby originally published in 1953.
Fremont High School refers to It's a Good Life (1961) in which the evil six-year-old boy is named Anthony Fremont (Bill Mumy).