This episode introduces the villain Danny "Brick" Brickwell. In DC comics, Brick was a black male with super strength and skin the texture of a brick wall. He was impervious to bullets and explosives. Though this Brick is not exactly bulletproof, he does survive multiple bullet wounds.
In a Hong Kong flashback, Amanda Waller says the "Alpha" is in the hands of the Hong Kong military. Hong Kong does not have its own military. Instead, there is a division of the PLA stationed in HK.
Roy makes a comment about Brick being in Iron Heights. Iron Heights is in Central City, home of the Flash.
In a nod to Snatch, Vinnie Jones plays Brickwell, also referred to in this episode as 'Brick Top' Bricktop was a character from Snatch played by Alan Ford which also starred Vinnie Jones as Bullet Tooth Tony.
Vinny Jones, who plays Brickwell, also played in another superhero franchise. He played the Juggernaut in the Marvel X-Men movies.