Many scenes are a nod to the 1990s romantic comedy Pretty Woman such as the scene on the streets where Oliver finds Mia at work and Mia putting on her red boots. Also the Lois and Clark TV show standee in the studio is the exact same pose as the one used in "Pretty Woman" with Richard Gere and Julia Roberts.
At the end when Lois shows Clark who KZXP 21 decided to go with for Good Morning Metropolis, the name you see is Catherine Grant. The name Cat Grant is also in "Supergirl" (2015) as Karas boss at CatCo.
Zod appears at Mercy's party and announces that he's the owner of R-A-O Industries. Rao is the god of the people of Krypton, where he's from, and as well as his comment about the sun... the yellow sun powers Clark and other Kryptonians have.
Rick tells Mia after she pays off her debt with Oliver's Aston Martin, that he was richer than the Luthor's. This is true Lex Luther's estimated net worth is 810 Million, whereas Oliver Queen's estimated net worth is 8 Billion. The only one richer is Bruce Wayne. Who's worth is $9.2 Billion, and lists his company, Wayne Enterprises, as having an annual revenue of $31.3 Billion
Michael Adamthwaite, who plays Rick, also played Andrew Connors in Season Two's "Precipice".