Mon-El mentions speaking to a Durlan ambassador. In the comics, Durlans are a species with the power of shape-shifting. In the 31st century, a Durlan with the code name "Chameleon Boy" serves alongside Mon-El in the Legion of Superheroes.
The opening shot of the Fortress of Solitude focuses on a gold ring with a stylised "L" engraved on it. This is Superman's Legion flight ring, given to him when (as Superboy) he travelled to the 31st Century and joined the the Legion of Superheroes. In the comics, both Kara and Mon-El also became members of the Legion.
Winn tricking the telepath Hannibal with a stapler is the same trick used by Batman in Batman Begins (2005).
This episode features both a former Lois Lane (Teri Hatcher) and Diana Prince/Wonder Woman (Lynda Carter).
Kevin Smith: [Star Wars] References and/or homages to Star Wars: Episode IV - A New Hope (1977) and its sequels.