1. In a throwaway Andaz Apna Apna dialogue, Amar says that Sholay is written by Prem's dad. Salman Khan, who plays Prem, is actually the son of the co-writer of Sholay, Salim Khan.
2. Kareena Kapoor was the original choice for Ameesha Patel's role in Kaho Naa Pyaar Hai, and actually shot a couple of scenes before quitting.
You can actually still spot Kapoor in a shot that slipped past the film's editors.
3. Actor Jagdish Raj holds the dubious Guinness World Record for being the "most typecast actor" ever, having played a cop in a whopping 144 different films.
4. Dilip Kumar was first offered the role of Sherif Ali in the 1962 epic Lawrence Of Arabia, a role later made famous by Egyptian actor Omar Sharif.
The film got Sharif worldwide acclaim, and gave him the opportunity to portray the lead in the iconic Oscar nominated film Doctor Zhivago.
5. The lead character of Anurag Kashyap's Gulaal makes a blink-and-you-miss-it appearance in his previous film Dev.D.
6. Before making a mark in Bollywood, Sridevi's first leading role was in the 1976 Tamil film Moondru Mudichu, in which she played Rajinikanth's stepmother at the age of just 13.
7. Rahul Khanna’s Canadian girlfriend in Bollywood/Hollywood was played by Jessica Paré a.k.a. Megan Draper from Mad Men.
8. In Rang De Basanti, Sue’s grandfather’s watch is shown to have stopped at 7:30 pm, which is the exact time Bhagat Singh was hanged in real life.
9. Before hitting the big time as Chatur in 3 Idiots, Omi Vaidya played bit roles in American sitcoms such as The Office and Arrested Development.
10. Kiran Rao made a fleeting appearance Aamir Khan's Dil Chahta Hai, four years before they got married.
11. A massive goof running throughout Lagaan has matches being played with six-ball overs. In 1893, the year in which the story is set, cricket rules only called five-ball overs.
12. Jeetendra's first appearance in a Bollywood film was in 1959 in Navrang, in which he was a body double for actress(!) Sandhya.
13. Dev Anand and Aditya Pancholi had a deceased stepmother in Awwal Number – supermodel Cindy Crawford.
14. Speaking of inexplicable cameos, the 1967 Rajendra Kumar film Aman had one by none other than the Nobel Prize winning British philosopher, Lord Bertrand Russell.
15. And the longest song in Bollywood history is the title track of Ab Tumhare Hawale Watan Saathiyo, spanning a gruesome 20 minutes.
