Learn what "i think there's a mistake" means, when people say it, and how to use it naturally in English.

It means the speaker believes something is incorrect and wants it checked.
From Trial Marriage to A Billionaire, Episode 12
Someone is politely saying they think something went wrong.
Use this in everyday situations, especially at work or in stores, when you want to point out an error politely. It is one of the safest and most reusable learner phrases here.
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