Did they really show an air cooler by mistake in the Mahabharata serial?

No, Mahabarata was nothing like Game of Thrones, it was directed with impeccable precision. The so called Cooler was not a cooler but part of a pole. The meme people cunningly cropped only part of picture where it looks like a cooler. And the whole world inclined forward to believe it.

Here is the correct picture.

BR Chopra was fantastic. Even Mukesh Khanna (played Bhishma's Character) made a statement that he won't believe any mistake in BR Chopra's creation. So won't I. :-)

Edit: Crossed 10k Upvotes, thanks guys for views and upvotes, your appreciation matters a lot. You all are fantastic.