When Steven is shown to the storage locker, the number 043 is next to a prominent scannable QR code that links to a page on the on the official Marvel website where it's possible to read a free digital copy of "Werewolf By Night #33," originally published in 1975, which features Moon Knight's second appearance in the comics. After the following episodes were released, the QR code redirected to the comics related to the latest episode.
The date of birth given on Marc's American passport is the real birthday of actor Oscar Isaac (March 9th), but the year shown is 1987 whereas Isaac was born in 1979.
In the establishing daytime shot of London as Steven and Layla head back to his flat, there is a white van and white car on Queenstown Road. In between those two vehicles is a Chinese takeaway called Moonlight Chinese.
When Steven sees Marc in the reflection of the storage locker, he greets Marc as the "man in the mirror." Michael Jackson's song of the same name is about making a change and realizing it has to start from within--an overarching theme of the Moon Knight show.