At 23:57 the image on the wall mural is that of Soviet leader Vladimir Lenin.
Rhashan Stone (Major Oliver Sinclair) & Jimi Mistry (Latif) also worked together on episode 1.3, The Entire History of You (2011), of Black Mirror (2011) as Jeff & Paul respectively.
The characters consistently mispronounce the capital of Hungary as "BudaPEST". Residents say "BudaPESHT".