The beer Mick was drinking has a Batman logo.
When Zari and Nate find the typewriter in Mick's quarters, one of the booby traps they set off is, ironically, dye from a dye pack, a countermeasure used by banks to keep thieves like Mick from absconding with the money they've stolen; once a dye pack is armed, a radio signal triggers a small explosion that releases the dye, which is notoriously difficult to remove, which in turn renders the bills unusable.
Ray references the Cause and Effect (1992) in which the characters experience a similar time loop leading to the repeated destruction of the Enterprise.
This episode features Vivaldi's "L'inverno" (Winter) Concerto No. 4 in F minor, Op. 8,4 'Winter':Largo' referencing Tala Ashe's real-life experience in playing the violin.
Hawkgirl's helmet is seen in Zari's "fun montage" scene, though Zari adopts a Catwoman-esque pose while wearing it.