When Reverse-Flash grabs the amulet from the case, you see a pair of Wonder Woman's magic bracelets sitting next to them.
When Dr. Stein tells the band to keep up with the changes before he sings Edelweiss, this is a reference to Back to the Future when Marty McFly tells the band at the Enchantment Under the Sea dance the same thing before singing "Johnny B. Goode."
The motor bike that Nate and his Grandfather were driving has the same licence plate as the one Steve McQueen rode in The Great Escape: WH13371.
The members of the Justice Society of America in this episode are Commander Steel, Hourman, Vixen, Obsidian, Dr. Mid-Nite and Stargirl.