Homelander's costume in this episode is very similar to the 2000 AD comics character Judge Dredd, right down to the color, oversized shoulder eagle and chain link.
Michael Cera and Kieran Culkin both previously starred together in Scott Pilgrim Vs The World (2011)
Jason Isaacs and Simon Pegg both starred in the Netflix series The Dark Crystal: Age of Resistance (2019) as The Emperor and The Chamberlain respectively.