When Stormfront and A-Train are having their discussion on set, Stormfront's drink cup actually reads "Storefront".
The Church of the Collective advert that the Deep stars in is a parody of the Gillette "We believe"/Toxic Masculinity advert.
The passing comment Homelander makes about the Joss rewrite of the Dawn Of The Seven movie is a reference to Joss Whedon's rewrite of Justice League (2017) which was met with a mostly negative fan and critic reception.
"We Gotta Go Now" is the name of the seventh story arc in the original 72-issue comic book series and the three companion-piece six-issue mini-series run of "The Boys", and also the name of the fourth trade paperback collection ("The Boys" #23-30).
The tv show that MM is watching while Hughie is on the phone with Butcher is Outlander.