1. First, here's Millie Bobby Brown and Dacre Montgomery taking a break while filming the Season 3 finale:
2. Here's a look inside the void, specifically when Eleven was spying on Lucas, Will, and Mike:
3. And here's how they filmed the scene where Eleven is falling through the void:
4. David Harbour being adorable in between takes:
5. Finn Wolfhard and Maya Hawke taking a much-deserved nap:
6. The Scoops Troop being adorable behind the scenes:
7. Joe Keery testing out a new wig for Steve:
8. Gaten Matarazzo cramming himself into a box so production can figure out how big to make the vent from Scoops Ahoy to the secret Russian elevator:
9. And, here's Priah Ferguson actually filming the scene where Erica crawls through the vent:
10. Sadie Sink and Millie striking a pose while filming in the rain:
11. The entire Stranger Things gang getting some notes while filming the finale:
12. Sadie and Millie trying to blend in with some mannequins inside the Starcourt Mall:
13. Millie, Maya, and Finn adorably sharing a chair in between scenes:
14. Millie rocking Eleven's iconic '80s look:
15. Winona Ryder preparing to film a classic Joyce and Hopper moment in the woods:
16. Millie and Noah Schnapp sharing this sweet moment with some hot sauce:
17. Here's David striking a pose in Hopper's amazing shirt:
18. Natalia Dyer getting ready to play Nancy in the hair and makeup trailer:
19. And here's a look inside the hair and makeup trailer:
20. Noah, Sadie, and Caleb McLaughlin showing off their candy while filming the opening movie theater scene:
21. Dacre and Cara Buono filming one of Billy and Karen's poolside chats:
22. Dacre and Millie sharing some food after saving the world from the Mind Flayer:
23. Maya and Joe rehearsing the scene where Robin comes out to Steve:
24. Charlie Heaton watching one of the scenes from the hospital:
25. Caleb giving the crew a thumbs-up:
26. Director Shawn Levy showing what it was like filming the Scoops Troop escaping the Starcourt Mall:
27. Joe, Finn, and Gaten playing a game of catch with a roll of paper towels in between scenes:
28. Dacre getting some notes while filming a scene:
29. Millie and Sadie hanging out in Will's fort during some downtime:
30. Charlie and Caleb can't stop laughing while filming together:
31. Charlie having some fun with a dummy version of one of the Russian spies:
32. Cara taking a much-needed break from the sun while filming poolside:
33. Here's what it looked like filming the big carnival scenes:
34. Millie and Sadie behind the scenes of Eleven and Max's sleepover:
35. Noah giving sliding in between the escalators like the Scoops Troop a try:
36. Here's the gang discussing how to defeat the Mind Flayer or Will pleading to play D&D:
37. And finally, Millie peacing out after filming a scene:
