Directed by Chad Lowe, who played Thomas Coville, the "villain of the week", in "The Faithful (2017)".
When Kara said I saw Clark do this once (spinning around and making a hole in concrete) is a reference to Superman (1978).
Mon-El says "grife", which in the comic books is an expletive used in the 31st Century by members of the Legion of Superheroes.
In the comics, Imra Ardeen is the member of the Legion of Superheroes known as Saturn Girl.
Mon-El mentions that the cure for his lead poisoning was developed by L-Corp, which suggests that Lena's desire to distance herself from Lex and do something good for the world has had some measure of success.