She did not say how many times she had seen the film before noticing the water bottles.
The gaffe was caught by Little Women superfan Madelyn Rancourt, who documented her finding in a TikTok video that quickly went viral.
Louisa May Alcott’s classic 1868 novel Little Women is known for being forward thinking – but not so forward thinking that it predicted the invention of plastic water bottles or Hydro Flasks.
Fans reacted with mirth and horror on Twitter, with some checking their own copies of the film to verify.