The packaging of the cassette tape that Kara has of her father's reads "Dreilide Thrace - Live At The Helice Opera House", an allusion to the Opera House visions shared by several characters throughout the show.
When Slick starts trying to write the second movement of his musical piece, the notes he plays for inspiration are the same notes from the start theme tune of the original Battlestar Galactica (1978) TV show.
While Boomer is escaping Galactica, she initiates her Raptor's FTL "jump drive" using an Apollo / Garmin 618C LORAN C altitude encoder; an obsolete piece of equipment by even early 21st century Earth standards. "618C" and "USA" are clearly displayed on the unit.
Both Aaron Douglas and Torrance Coombs stared in Killer Mountain (2011) together and also were in this episode as well.