Both actors confirmed this with posts on Instagram; Brown, in particular, posted about it twice. Her first post reads "That's a wrap" with a heart emoji and included two photos, one of her with Noah Schnapp (Will Byers), and one of her with Sadie Sink ("Max" Mayfield).
The second post was a black-and-white photo of Brown hugging Sink with the caption reading, "As we said goodbye, I gave my best friend the biggest hug and told her I loved her so much. My sister forever @sadiesink_"
Harbour's singular post showed the Hellboy actor wearing the hat of a fictional plumbing and heating business in the town of Hawkins. The caption bids adieu to the mustache that Hopper will be rocking in Season 3 and urges Steven Spielberg to "eat his heart out."
"Wrapped. Everyone say ‘goodbye mustache.’ If you need any info on what’s good in Hawkins while I’m away, give Gary a call. He can’t keep his damn mouth shut. #spoilerswithoutcontext #awfullogos#facecaterpillar #bestjobever #fletch#speilbergeatyourheartout," wrote Harbour.
While Netflix has not yet set a release date for Season 3 of Stranger Things (it's expected to drop in 2019 sometime), we do know that it will take place over the summer of 1985. That means you must prepare yourself for plenty of Back to the Future references.
Netflix did not immediately respond to SYFY WIRE's request for comment.