When Raj and Taani are having a competition to see who can eat the more 'gol gappas', Taani's nail polish colour continues to change from red to pink.
Raj shows Taani "I LOVE U" written all over the Amritsar town to express his love for her. The next shot shows a close-up of Taani and one can see the reflection of "I LOVE U" in her eyes, but the it's not a mirror image as it should be.
Raj Kapoor (Sharukh Khan) proposes to Taani (Anushka Sharma) by means of electricity lighted in such a way that it looks like I LOVE YOU when viewed from top. But electricity supplied to the public is supplied in series, not in parallel.
In the song "Hum hain raahi pyar ke"'s 4th part starring Priety Zinta, she and Raj dance close to a tree. t is accidentally touched by Raj, and the tree trembles for a few seconds. This is because that part of song had a digitally added background and therefore the tree was fake too, and so it shook on a slight touch.