As Barry makes breakfast, he makes a sideways-slide entrance to Bob Seger's "Old Time Rock and Roll" a la Tom Cruise in Risky Business (1983).
The penthouse apartment from the opening is a set from Arrow (at various times it has been Malcolm's, Thea's, Oliver's and Felicity's).
The TV series that Barry was 'speed watching' to catch up on what he'd missed while trapped in the Speed Force was Game of Thrones (2011).
The video game that Shelia Agnani was playing right before her attack is Dying Light (2015). It is a zombie horror-survival game produced by Techland that features the player character using parkour mechanics to climb cars and buildings to avoid being on the ground where zombies can get them.
In the DC comics, Kilg%re is an electro-organic intelligence that consumes electrical life to survive. He has a robotic body and possesses electrokinesis allowing him to interface with technology. He is an enemy of the Flash, as well as the Justice League.