Stranger Things fans claim to have discovered a “plot hole” in the latest season of the popular Netflix sci-fi thriller.

The show returned to television screens this week after an almost three-year break, and critics have praised it.

Nonetheless, a few story lines have left viewers perplexed, with one in particular eliciting some bewildered social media replies.

As fans of the programme will recall, Eleven (Millie Bobby Brown) first appeared in season one and was unable to talk.

The other kids had to teach her how to communicate, and she finally became more fluent throughout the course of the episode.

Stranger Things 4 does, however, dig into some of Eleven’s recollections from her time in the Hawkins lab.

Fans believe they’ve detected a difference between the character’s speech in flashbacks and how it was presented at the beginning of the series.

One viewer wrote: “Stranger Things plot hole: Eleven couldn’t talk when she initially escaped & met Mike & the gang. Why in season 4 is she able to speak full sentences in the flashbacks?”

“The only plot hole in eleven’s memories is that she speaks too well girl could barely say ‘no’ when we first met her,” another wrote.

“The most glaring plot hole in this season of Stranger Things is if I remember correctly El had to be taught to speak when she escaped in season 1 but now in these flashbacks she’s talking just [fine],” someone else observed.

“I haven’t watched season 1 in a loong time but Did eleven like forget how to talk when she escaped the lab cuz In her memories, she spoke fluently and I thought that was odd,” another fan wrote. “Cuz from what I remember, she was sort of a mute in season 1 that slowly learned how to speak.”

While it’s unclear whether this was a mistake by the show’s writers, one fan speculated that Eleven’s speech regressed as a result of the stress she underwent at the lab.

Stranger Things is now available to watch on Netflix.

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