Warning: Spoilers ahead for the entire second season of "Stranger Things."

"Stranger Things 2" is now streaming on Netflix, and we've parsed through every scene to find the biggest callbacks to season one or revelations hidden in the corners of sets or spelled out through dialogue. For this roundup, we're looking at important moments within the "Stranger Things" universe itself, and leaving all the references to 80s movies and pop culture for another time.

Keep scrolling for a look at 11 details you might have overlooked on the second season of "Stranger Things."