Tonight saw the episode of DC's Legends Of Tomorrow air featuring Stephen Amell thirty years in the future as the older Oliver Queen Green Arrow.
Per the norm, the episode was filled with Easter Eggs to the DC universe, including that Connor Hawke is actually John Diggle Jr.
One possible Easter Egg that you might have missed is a reference to Green Lantern.
Oliver mentions a warehouse that stores all of Felicity's old tech. The warehouse happens to be located on "Adams and O’Neill."
Other Easter Eggs from the episode include the one-arm Green Arrow from Frank Miller's The Dark Knight Returns and Slade Wilson's son, who is Ravager in the comics.
"DC's Legends Of Tomorrow" airs Thursday's at 8pm ET on The CW starring Arthur Darvill as Rip Hunter, Victor Garber as Dr. Martin Stein, Brandon Routh as Ray Palmer, Caity Lotz as Sara Lance, Ciara Renée as Hawkgirl, Franz Drameh as Firestorm, Dominic Purcell as Heatwave, Wentworth Miller as Captain Cold, Falk Hentschel as Hawkman, and Casper Crump as Vandal Savage.