Stranger Things fans are zeroing in on an unexpected continuity slip in part 2 of the show's fifth season, and it has nothing to do with monsters from the Upside Down.
During a tense scene in Episode 7, where Holly Wheeler manages to break free from Vecna's clutches, sharp-eyed viewers noticed that the character appears to be wearing Under Armour apparel. The issue with this moment is that Stranger Things is a period piece set firmly in the 1980s, while Under Armour wasn't founded until 1996.
The blink-and-you'll-miss-it wardrobe detail quickly went viral on X, with fans accusing the show of sloppy oversight after years of meticulous period accuracy.
One viewer wrote, "A clothes error, you can see while Holly is escaping in episode 7 that she's wearing some Under Armour undershirt and the brand was created in 1996."
Another joked, "Holly wearing Under Armour in season five is more unsettling than Vecna. Did she tear through the fabric of space and time and go into the future?"
Others called out how all the focus put into Will Byers' speech during the episode created the mess and compared the mishap to one of television's most infamous production errors: the Starbucks cup that briefly appeared in Game of Thrones Season 8.
"If Stranger Things didn't spend 24 HOURS in filming/reshoots for Will's "coming out" scene, they wouldn't miss Holly Wheeler wearing a company's shirt that didn't even exist in the 80s (Under Amour) This is like the Starbucks cup in Game of Thrones S8."
The Under Armour slip has only fueled broader frustration around Part 2 of the final season. While anticipation was sky-high, many fans felt the episodes didn't fully deliver. Some viewers complained that Eleven was sidelined emotionally and narratively, calling her role an afterthought despite being central to the show's mythology.
Will Byers' coming-out moment also sparked mixed reactions. While some praised the representation, others felt the scene was unnecessary given how fans already assumed he was gay.
Taken together, the Under Armour error became symbolic of what critics see as a drop in attention to detail, a surprising critique for a series long praised for its obsessive commitment to 1980s authenticity.
As the show heads toward its conclusion, fans are still celebrating Stranger Things, hoping for a great finale, but moments like this have some fans upset with what they see as carelessness.
Check out more reactions to Stranger Things season five part two below.