One of the aliens seen on the promenade deck of the cruiser in the flashback bears a striking resemblance to Zoidberg, from Futurama.
Despite the election of Bouncing Boy to the leadership of the Legion in a prior chapter, there has apparently been a subsequent election which restored Cosmic Boy/Rokk Krin to the position of Leader.
It is revealed that Chameleon Boy is actually the son of R J Brande, a fact established in a comic book mini-series in the late 1970's.
While the three heroes are investigating the attack on Brande, they pass a Xudarian youth on the streets of New Metropolis. Xudarian is the race of Tomar-Re, who distinguished himself as a Green Lantern from Sector 2813 back in the 20th Century.