At first glance, this picture looks like a perfect time capsule from the 1970s. Five young women are walking arm-in-arm down a city street, smiling, wearing everything that defined the decade: mini skirts, high-waisted shorts, ruffled blouses, paisley prints, white go-go boots and lace-up boots. The faded film colors and the concrete apartment blocks in the background make it feel completely authentic. But look closer, because one small detail does not belong in this era. Can you find it?

The answer is hanging from the belt of the fourth girl from the left. She has a keychain with what is clearly a modern remote car key – the black plastic fob with buttons to lock and unlock the car. In the 1970s, car keys were simple metal keys, nothing more. Remote central locking and keyless fobs did not exist for everyday cars until the late 1980s and became common only in the 1990s and 2000s.

>>> LOOK HERE: The modern remote keychain on the brown jumpsuit <<< That small black fob with the buttons is a time-traveling object. Whether the photo was recreated later as a retro editorial or it is an original photo where someone later added keys, it betrays the whole illusion. Everything else is period-correct: the clothes, the hairstyles, the handbags. But that tiny detail is a classic anachronism, like seeing a smartphone in a movie about the Middle Ages. So, did you spot it before reading the answer? It is a great reminder of how a single small detail can break an entire illusion. The 1970s gave us freedom in fashion, but it definitely did not give us remote car keys. Next time you see a vintage photo, look at the details - you never know what is hiding in plain sight