7. Are there at least 10 other psychic children?
The boys give Eleven her name because of a tattoo on her forearm: "011." This implies there are -- or were -- more psychic kids, right? If Terry got pregnant without knowing it during her time being subjected to MKUltra tests, the possibility that El might not be the only child is very disturbing. Was Brenner (or someone -- or something -- else) impregnating subjects long before Terry had her child taken from her? If so, will the show introduce characters with, say, a mysterious 005 -- or even cooler, 007 -- tattooed on their forearms?
8. Why did it take the monster so long to find Will?
The seventh episode of Stranger Things ratchets up the tension by ending on the monster finding Camp Byers, Will's hiding spot in the Upside Down. Up to that point, the monster had been mostly focusing on other things -- dragging Barb into his dimension, mauling a deer, playing hide-and-seek with Nancy. But then all of a sudden he finds Will. What gives? Is Will unique, or somehow different than Barb, who got webbed and tentacled much more quickly? Complicating matters: Eleven has a vision of a slug crawling out of Barbara's dead body. Will suffers from the same symptom in the final scene of the show. Did the monster know something about Will that we don't?
9. Is Will the flea?
On that same point, the end of Stranger Things offers a possible setup for Season 2: when Will goes to the bathroom and pukes up a slug into the sink, he is briefly transported to the Upside Down without needing a portal to pass through. It seems like staying so long in the universe's toxic atmosphere may have had some side effects. That, or Will always had the ability to portal into the Upside Down, and that's why he was a target in the first place.
10. Who fixed the Byers family house?
A one-month time jump doesn't adequately explain how Joyce Byers (Winona Ryder), a single mother in 1983 who needed a two-week advance to buy Christmas lights when her son went missing, manages to get her very damaged house fixed and still have enough left over to buy Will an Atari for Christmas. I'd suggest that the town pitched in to help repair the burnt hallway, the gasoline-soaked carpet, the black paint on wallpaper, and the destroyed living-room walls, but I'm pretty sure the deal made with the government meant that Joyce couldn't talk about why she messed up her house so badly. Where'd all that money and manpower come from? I smell conspiracy.
11. Why does Will roll multiple dice to cast fireball during the first Dungeons & Dragons campaign?
First off, casting fireball doesn't require an attack roll; his target needs to roll a save. Second of all, even if Will was rolling a save (for some reason), he'd only roll a single d20, not two handfuls of dramatically exploding dice. Third, Stranger Things really asks for the full nerd treatment, so don't look at me that way.