Like Stars on Earth (2007)
the scene in TZP where Ishan gets lost in the crowd temporarily losing his mom's hand at a railway station is an homage to the scene where christian bale's character loses his mother's hand in the crowd while leaving their city during mid-war time
the children in classroom sing the title track from that movie.
A guy, while referring to TZP, says to another guy, during the college farewell party, that his life story was pretty much similar to the story of TZP
Aamir Khan's character in both the films gives similar message to the parents of an ambitious child (dyslexic boy Ishan in TZP & his friend Farhan in 3i) i.e. to let their child follow his 'dream/passion' (viz. 'painting' in TZP and 'wildlife photography' in 3i)
Naseer passes a comment on the film
Abhimanyu's son Veer is shown watching this movie.