The middle school scenes were shot at the now-defunct Patrick Henry High School in Stockbridge, Georgia. This is the same location used for both Hawkins Middle and Hawkins High Schools in seasons 1 and 2 of Stranger Things (2016).
Brandon Breyer's name follows the classic comic-book convention of superheroes with alliterative first and last names, such as Clark Kent, Peter Parker, Bruce Banner, etc.
Brightburn is mentioned as being in Kansas - and Brandon's dad's truck license plate is Kansas-issue - which is where Kal-El landed and later grew up to become Superman.
In many scenes, Brandon wears combinations of blue, red and yellow, the main colors in Superman's traditional outfit; This motif was also used on the character Clark Kent in the TV series Smallville (2001).
The house that the family lives in is not the same house that features in Things Heard & Seen (2021).