Near the end of the episode, Clark ask Bart what he is going to do and Bart replies "find more people like us, maybe start a club or a league or something" referencing the Justice League that the Flash and Superman would later be founding members of.
Michael Rosenbaum was the voice for the Flash in the animated series "Justice League."
When Clark breaks into Bart Allen's hotel room and goes through his wallet, he sees 3 IDs: Jay Garrick, Barry Allen, and Wally West. These were/are names of all the Flashes. Jay Garrick is the original WWII-era Flash (who sometimes watches over Bart), Barry Allen was the pre-80's Flash who died in "Crisis on Infinite Earths"(and Bart's grandfather), and Wally West was the Flash during the 2nd Crisis (and Bart's official guardian). Bart Allen himself has been known as Impulse, Kid Flash, and the Flash.
When Bart hits on Chloe, he briefly mentions coming from the future. In the comics, Bart Allen was actually sent from the 31st century by his grandmother to be taken care of by Wally West.
This episode aired two days before Kyle Gallner's 18th birthday.