In the first episode of Moon Knight, titled "The Goldfish Problem", there was this dialogue between Steven Grant and a little girl in the museum:
Steven Grant: They'd take this big metal hook, right? And they go up the old nozzle and... [makes slurping sound] all the organs would come out. Except for the heart.
Little Girl: How come?
Steven Grant: Because they believed you needed your heart to be judged in the Underworld and only the worthiest would be allowed to pass through the Field of Reeds.
Little Girl: And did it suck for you? Getting rejected from the Field of Reeds?
Steven Grant: Well, that doesn't make sense 'cause I'm not dead, am I?
The girl's question is strange. They are talking about an ancient Egyptian afterlife belief, but the girl asked why Steven Grant got rejected from the Fields of Reeds which (as Steven Grant replies) doesn't make sense because he's not dead.
The girl's question also foreshadows events that will happen in the later episodes. Steven Grant (and Marc Spector) do indeed die and get to the ancient Egyptian afterlife/underworld (the Duat) in ep. 4. Steven gets stuck in the sands of the Duat and was unable to enter ("rejected from") the Field of Reeds (ep. 5). Only Marc was able to pass through the Field of Reeds (ep. 5) but decides to leave it (ep. 6) and rescues Steven from the sands.
In ep. 5, in the Duat, Taweret (Egyptian goddess of women and children, and Duat guide) says to Steven and Marc:
Because the Duat's true nature is impossible for the human mind to comprehend, you may perceive this realm as something more easily recognizable to you.
I was wondering if perhaps the ep. 1 scene where the "rejected from the Field of Reeds" dialogue took place might be part of the Duat and Steven was perceiving it as "something more easily recognizable to [him]."
Also, Marc / Steven is insane (as Marc himself admits in ep. 5). After Khonshu releases Marc and Steven, they get back to Dr. Harrow's office, where they realize that Dr. Harrow and his office are just figments of their imagination.
It seems that the little girl knows more than she lets on. Is she a figment of Marc / Steven's imagination (like the scenes with "Dr. Harrow")? Or was she of a supernatural background, maybe connected to one of the Egyptian gods? (Egyptian gods have been shown to be able to speak through humans in Moon Knight.) Or is this something more mundane, just a kid being a kid and asking strange questions?