- The Imperial Institute of Technology in the film is the old name of the current Indian Institute of Technology.
- The campus that appears in the film is the campus of the Indian Institute of Management, where the crew filmed for 33 days.
- Rancho said in the film that some people first studied machinery, then management, and finally became bankers. This is precisely the trajectory of the novel author Chaten Begat. Zichateng Baigat first studied mechanics at the Indian Institute of Technology, then management at the Indian Institute of Management, and finally became a banker.
- The film was shot in cities in Delhi, Bangalore, Mumbai, and Shimla.
- The film’s producer, Chopra, once stated that "Three Idiots" will be available on YouTube within 12 weeks after its release in theaters-this will be the first Indian film to officially land on YouTube legally-but it is a pity , The video finally failed to appear on YouTube.
- After the film was released, it broke many records in the Indian box office. It is also the second best-selling Indian film overseas.
- Many gadgets invented by Indians are used in the film, such as the razor that uses the power of a bicycle to shear wool.
- Director Rakuma Hirani asked his older male protagonists to lose weight, and at the same time asked the female protagonist to gain weight. His approach was ridiculed by the crew as "the most idiotic director in history." But Hillani later defended that it was a joke he made to the crew.
- Amir Khan, who plays Rancho in the film, refuses to enjoy his birthday cake. When others ask him why, he replied that he only drinks milk and eats a little banana every day. For the role of Rancho, he wants to lose weight.
- Fahan used a Nikon manual film SLR camera at the beginning of the film. When he graduated, his father bought him a new camera, which was a Nikon DSLR.
- Volvo's XC-90 R-Design appeared in the film, which is a new SUV sedan from 2010.
3 Idiots behind the scenes gags
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Chatur Ramalingam aka 'Silencer': [In the auditorium, delivering a speech] Today, if ICE is touching sky-high limits, then the credit goes to only one man: Shri Viru Sahastrabudhhe! Give him a hand!
Librarian Dubey: [Leans towards Sahastrabudhhe] Sir, the voice is his, but the words are mine.
Chatur Ramalingam aka 'Silencer': He's a great guy, really, you are. For the past 32 years in this college, he has continuously committed rapes upon rapes.
Rancho: [to Rastogi] He meant, "Miracles upon miracles."
Chatur Ramalingam aka 'Silencer': I hope he continues to do so. We often wondered how a person in his lifetime can do these many rapes. With this extreme self-discipline, he's made himself this capable. Correct usage of time, complete utilization of the bell. Somebody learn from him. Learn from him. Learn from him!
Minister in Auditorium: [Holding back Sahastrabudhhe] Sit down, sit down!
Chatur Ramalingam aka 'Silencer': Today, we all students are here. Tomorrow, we'll spread across so many countries. I promise you all, whichever country we are in, there we'll rape! We'll bring glory to the name of ICE! We'll show everyone the ability to rape that students over here have. No other student across the globe has it! No other student! No other student!
[after waiting for the chanting to die down]
Chatur Ramalingam aka 'Silencer': Respected minister, namaskar. You have given the thing this institution needs the most:...
Rancho: Money! Money!
Chatur Ramalingam aka 'Silencer': Breasts!
Librarian Dubey: Not that! That word means this!
[Gestures breasts with his hands]
Minister in Auditorium: What kind of insulting things is this boy saying?
Chatur Ramalingam aka 'Silencer': Everyone has breasts.
[Shoves hand into pocket]
Chatur Ramalingam aka 'Silencer': Everyone keeps it hidden. Nobody ever gives it willingly!
Minister in Auditorium: This guy is too vulgar!
Chatur Ramalingam aka 'Silencer': You have given your breasts to the hands of this rapist. Now, let us see how he makes use of it.
Minister in Auditorium: Sahstrabudhhe, don't you have any brains? Indecent guy.
[walks out of the auditorium]
Chatur Ramalingam aka 'Silencer': Let me recite a shlok for this golden occasion.
Rancho: Listen. Listen. He'll explain his farts in Sanskrit.
Chatur Ramalingam aka 'Silencer': The loudest fart sounds like a motor vehicle.
Millimeter - MM: Fart? Go, silencer!
Chatur Ramalingam aka 'Silencer': A weaker one sounds like a train. The weakest fart is a silent killer.
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Pia V. Sahastrabudhhe: You Gujaratis are so cute. But why does your food sound so dangerous? Dhokla, fafda, handwa, thepla, khakhra, they sound like missiles. Today, Bush dropped two dhoklas on Iraq: 400 dead, 200 injured. I can deal with khakhra, fafda, but your name? Ranchhodddas Shamaldas Chanchad. Yuck! I won't change my last name after marriage