The blunder was spotted near the start of the first season, which began with one of the show’s first flashback’s to reveal the death of John Dutton’s (played by Kevin Costner) wife, Evelyn (Gretchen Mol).
While most viewers were caught up in the emotion of Kayce (Luke Grimes) and Beth (Kelly Reilly) losing their mother, more critical fans couldn’t help but look more closely at the background of the scene.
Their digging seems to have exposed an error in the show’s timeline, as the setting contradicted when the episode claims to be taking place.
One particular viewer took the complaint to online forums when they noticed the flashback’s location didn’t match up to the purported timeline.
source: express.co.uk