When Cisco Ramon said to Caitlin Snow, "Are you getting a "bad vibe" off this guy" it is an indirect reference to Cisco Ramon's DC character "Vibe".
First appearance of Cisco Ramon and Caitlin Snow in the Arrowverse
Cisco mentioned Dr. Arthur Light and called him a "psycho". Arthur Light in the DC comics is known as the villain Doctor Light.
"Schastlivchik" translates, roughly, as "lucky beggar" or "lucky devil."