The title of the episode, Cibola Burn, is also the title of Book 4 in The Expanse series, of which this season is based
Brian George played Arjun until 3rd season and replaced by Michael Benyaer for 4th season
Right after the scene with Avasalara saying that Gao has a great campaign narrative, Bobby Draper is scrolling through the names on her device. She comes across the names A. Wesker and G Freeman. These could be the names of Albert Wesker, CEO of Umbrella Corporation and main antagonist from both the video game series Resident Evil (1996) and the film series Resident Evil (2002). The other name could be Gordon Freeman, the main character and protagonist from the Half-Life (1998) series.