Nahn is established as Discovery's new chief of security (following the death of Cmdr. Landry and the departure of Lt. Tyler in season 1). When she came aboard Discovery with Pike (and science officer Connolly) in Brother (2019), she was identified as an engineer. Both departments wear the same uniform color (red in the Enterprise's coding, bronze in Discovery's), but their duties and specialization don't overlap.
Pike recalls that he attended Starfleet Academy with Phillipa Georgiou, suggesting they are contemporaries. In real life, Michelle Yeoh is 11 years older than Anson Mount.
When Captain Pike mentions to Leland about being 'up to his neck in crocs' , this has a sarcastic foreshadowing in regards to next episodes progress involving more Klingon culture. In this stardate could be a subtle reference towards Arena (1967) when Captain Kirk battles a Gorn; which was a reptilian like alien race, which has yet to be confronted.