The iconic movie line "General, would you care to step outside?" was said to General Zod in Superman II (1980).
Before the Fight between Dru-Zod and Seg-El, Seg walks back, takes off his jacket and says, "General, would you care to step outside?" The same line his grandson Superman, played by Christopher Reeve, used on General Zod in Superman II.
The suit that Val-El makes for Adam Strange very much resembles that which Strange wears in the comics. Furthermore it includes a jetpack, as in the comics.
As Nyssa-Vex looks up to the sky, she sees winged humanoids flying above. Had there been a third season, they might have been revealed to be the Thanagarians, which is the race of Hawkman. If true, this means the planet she zeta-beamed to was likely Thanagar.
Season finale