Parts of the 'Ishq Shava' song were shot in Leake Street's 'Banksy Tunnel' in central London, where 'F**k' had been written in graffiti on one of the walls.
"SRK and Katrina's character meet at the bar of hip, subterranean club decorated with graffitied slogans and artwork. On one of the walls was the phrase 'F**k TV'," a source told Digital Spy.
"A number of scenes had already been shot with the stars before producers realised what was written behind them. A member of production painted over part of the graffiti, so that it then read 'Pock TV'. But observant fans may be able to spot the original phrase by freeze framing the video."
The dance track has already had over 100,000 views on YouTube in the 24 hours since its release.
Producers are expected to unveil the full 4:32 version of the song, as well as the 'Ishq Dance' instrumental, once Jab Tak Hai Jaan has opened in cinemas.
Jab Tak Hai Jaan, directed by the late Yash Chopra, releases during Diwali on November 13.
Watch the new track 'Ishq Shava' below: