The Stranger Things fandom has a reputation for catching details others miss, and Season 5, Volume 2 gave them fresh material to study frame by frame.
This time, a small wardrobe detail triggered a big reaction online, and fans quickly flagged what they believe is a clear timeline mistake. Once you see it, it becomes hard to ignore. Reddit users have noticed the Under Armour logo on Holly's clothes. But the plot twist is, the brand was founded in '96 yet Stranger Things is set in 1980.
The major mistake in Stranger Things Season 5 Volume 2: Details explored
Where the mistake appears in Season 5
The moment happens in Stranger Things Season 5, Volume 2, Episode 7, and Holly is shown trapped in Dimension X alongside other children from Hawkins.
Vecna holds them inside a vine-covered, goo-filled prison. During her escape attempt, Holly struggles against the vines. As she moves, the sleeve of her sweater rolls up. That brief movement reveals an Under Armour undershirt underneath.
Why do fans immediately raise an alarm?
The Under Armour logo is clear and easy to recognize, and fans noticed it almost instantly on Reddit. The issue is not the shirt itself, but the timing.
Season 5 still takes place in the 1980s. Under Armour was founded in 1996, and that puts the brand nearly a decade outside the show’s timeline.
How the fandom broke it down
Fans did not treat this as a random guess, and many double-checked brand history before posting. Others replayed the scene to confirm the logo. Screenshots began circulating within hours of the episode dropping.
Some viewers joked that Vecna now controls future fashion, and others were more serious about the flop.
Why this detail matters to viewers
Stranger Things has always leaned heavily on period accuracy. The show built trust through music, clothes, and set design.
Small details help sell the 1980s setting, and fans expect that level of care after five seasons. A modern logo breaks immersion, even for a few seconds. For detail-focused viewers, that moment pulls them out of the scene.
Not the first continuity slip
Long-running shows often struggle with small errors. The show has even faced timeline debates before. The past seasons sparked arguments over dates and technology. Most of those issues were minor and quickly forgotten.
This one stands out because the logo is so obvious, and it is not hidden in the background or blurred.
How do production mistakes like this happen
Modern productions rely on massive costume departments, and many scenes are shot out of order. Actors often wear layered clothing for comfort.
A logo can slip through during filming or editing. Visual effects teams focus on creatures and environments first. A sleeve detail can easily escape notice.

Will Netflix or the Duffer Brothers respond?
So far, there has been no official comment. Netflix rarely addresses small continuity errors, and the Duffer Brothers have spoken openly about bigger plot issues before.
This feels more like a behind-the-scenes oversight, and fans do not expect a reshoot or edit. The moment in Stranger Things will likely stay as-is.
The Under Armour slip shows how sharp the audience is. Few shows get watched this closely. That level of scrutiny reflects deep fan investment, and even mistakes become part of the conversation.
Strangely, it proves the show’s cultural reach, and nothing gets past the Hawkins faithful.