Preminger really does need help cataloging the museum's collection - Emanuel Leutze's famous painting "Washington Crossing The Delaware" is seen in the basement.
After The Flash tells him to pull over, Mortelli crashes at the corner of 4th and Garrick, another reference to Jay Garrick, the Golden Age Flash.
While waiting for Preminger in the museum, Barry admires a statue of Mercury. In Roman mythology Mercury is the god of speed and also resembles the Golden Age Flash.
Barry says that he last saw Preminger 10 years ago, and comments that that was when he was 19, telling us that he's now 29.
This episode was the first one filmed after the pilot, but the airing was delayed.
During the press briefing, Lestrange comments that the Italian press had labeled Franco Mortelli "the fastest man alive" while Barry smirks. "The Fastest Man Alive" is one of the nicknames traditionally used to describe The Flash (similar to "The Man Of Steel", etc.)
Honor Among Thieves:
The phrase finds its beginnings in 17th Century Europe. It wasn't till the 1800s when it came to the form known in the present day.