In addition to mentioning the 'Yelchin', the 'Nog' is named as part of the evacuation. This could hint to the fate of Ensign Nog from Deep Space Nine, as eventually becoming important enough in Starfleet to have a ship named after him. In the alternate future depicted in 'The Visitor', Nog makes the rank of Captain. It could also serve as tribute to Anton Yelchin (Chekhov, Kelvin timeline) and Aron Eisenberg (Nog, DS9), two members of the Star Trek family who died at an early age.
Again the Puerto Rican drink Maví is mentioned as it was established is a drink from the hometown of Dr. Culber In Season 4 episode 11 (Rosetta) .