It's the tiniest detail but it opens up all sorts of questions about Henry's past.
The siblings recently admitted they made a mistake in the latest season when fans pointed out an error surrounding Will Byers' birthday.
Even a Stranger Things super fan might struggle to notice these tiny details
David Harbour has spoken out about his Stranger Things co-stars growing up in the spotlight
It's hard to ignore, and the cast have admitted they think about it a lot
The Stranger Things star surprised the creators by correctly guessing their idea
The hit sci-fi series has some serious competition...
The trailer for the second part of Stranger Things 4 has dropped, teasing the next two episodes for Netflix.
Despite appearing in some of the biggest titles in teen TV and film, the actor believes the industry doesn't want to hire 'fat' stars
The Netflix show enlisted the help of young actor Martie Blair to stand-in for some of Eleven's flashback scenes.
The Duffer Brothers have warned Stranger Things fans not to expect a happy ending.
In the weeks between Stranger Things episodes fans are coming up with all sorts of theories.
The Stranger Things star admitted she had not heard of Kate Bush before the show
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The moment has gone down a treat with viewers, who commented in their droves about his uncanny likeness to the beloved Friends character.
The actor who plays Steve Harrington showed support for his younger cast mates at Comic Con
The actor was pushed out by his co-stars
'Running Up That Hill' rose up the charts after being featured on Stranger Things
The first volume of season four is available to watch on Netflix now
Viewers will be getting just 'one more season' as the show concludes with a fifth and final series
The volume one finale episode of Stranger Things season four saddled fans with a plethora of burning questions and not many answers
Is this the key to the code?