Did You Know Koi... Mil Gaya was initially going to be titled Koi...Tumsa Nahin or Kaisa Jaadu Kiya? It was Rakesh Roshan who later decided to change the name to Koi... Mil Gaya.
The character Jadoo in the film isn’t an animation but was played by actor Indravadan Purohit who was popularly known as Chhote Ustaad.
Not Preity Zinta, but Aishwarya Rai was the first choice to play Nisha’s role in the film reportedly.
The bullying scene of Hrithik's character was taken from his own childhood.
The makers had shot two different endings for the film. Apparently, the one where Jaadu gives back the powers to Rohit, makes it to the final cut, or else Krrish would have never been made.
It was Anil Kapoor who convinced Rakesh Roshan to make Koi Mil Gaya.