- The French waiter who talks about cheese in the trailer is voiced by director Brad Bird.
- At the very beginning of the trailer, a flyover appeared in a prominent place, and you can easily recognize it as the famous "Bridge of Arts" in Paris. As for the fictional hotel in the film, it is located across the Seine River, next to the Louvre, and to the southwest of the Carrousel Bridge. However, starting from this part of the Musée d’Orsay, Paris in the film has been slightly changed compared with the real world.
- In the process of making the film, the animation team has been assisted by Thomas Keller, the top celebrity chef in the United States. He has his own restaurant called "French Laundromat Restaurant". In addition, Keller also played a guest voice in the film, his role is a sponsor of the restaurant opened by Gust.
- The film's art and design director Michael Watcher, has a qualification certificate as a chef.
- When designing the mouse, the film made many artificial changes, including the nose and ears. Debbie Dikoman, a rodent expert and founder of the International Mouse Fan Club, also specially sent a few pet mice of his own for observation and experimentation in the art and animation departments.
- In order to make the garbage dump look more real, the animator specially studied the appearance of real agricultural products when they rot. A total of 15 crops with completely different properties were put there to rot a little bit, and then photographed and observed, including apples, berries, bananas, mushrooms, oranges, broccoli and lettuce.
- In the process of designing the image of the character, the sculptor made a total of 9 handmade clay statues for the protagonist Xiaomi, 6 of which represent different stages of the character’s design, and the remaining 3 represent the final A design of different poses.
- Ratatouille, originally a traditional French dish-vegetable chowder. The story of the film is about a little mouse who lives in a Parisian restaurant and considers himself a great chef. Ratatouille is his name.
Ratatouille behind the scenes gags
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Linguini: I know this sounds insane, but... well, the truth sounds insane sometimes, but that doesn't mean it's not. Uh, the, the truth. And the truth is, I have no talent at all. But this rat, he's the one behind these recipes, he's the cook! The real cook. He's been hiding under my toque. He's the reason I can cook the food that's exciting everyone, the reason Ego is outside that door! I know it's hard to believe, but hey, you believed I could cook, right? Look. This works. It's crazy but it works. We can be the greatest restaurant in Paris and this rat, this *brilliant* Little Chef, can lead us there. What do you say?
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Gusteau: If you focus on what you left behind you will never see what lies ahead!