Upon arriving on the films sets, Raaj Kumar realized that Dilip Kumar's character spoke Hindi with a U.P. BIhari dialect. This angered him as he was to speak regular Hindi in the film and he was not told about Dilip's characters Hindi. He told Subash Ghai he was quitting the film right there and then and returning back to Bombay. Subhash Ghai had to go and convince Raaj Kumar for two hours to remain in the film. Ghai reasoned that Raaj Kumar's character was rich and royal where as Dilip's was a poor lower cast character. Hearing this Raaj Kumar finally relented and stayed in the film.
Both legends Dilip Kumar and Raj Kumar were very much impressed with the music.
When the final cast was announced the media asked Subhash Ghai why he did not cast Dev Anand opposite Dilip Kumar in the film. Subhash stated he would never be capable of directing Dev Anand. The reason was because if Dev would appear in front of him,he (Ghai) would be in awe of him and once again be a school boy fan of his. He would not be able to look at Dev Anand as a actor.
The song " Ahun Ahun" from Love Aaj Kal was sampled from the Punjabi song " Has Bol Ve" by Madan Maddi from the album " Has Bol Ve" and Deewane Tere Naam Ke from Saudagar. It was also heard in 2002 from the Pakistani film Dada Badmaash. The song was titled "Kadi Has Bol Ve" sung by Naseebo Lal. Channa Tu Bemisal from.Mere Husband Ki Biwi also sampled the same tune.