The devil is in the details

This saying implies that small things or specifics in a plan or task are what can cause it to go wrong or fail, rather than the larger, more obvious aspects. When we say “The devil is in the details,” we’re emphasizing the importance of paying attention to the finer points of something. It suggests that overlooking or neglecting these minor details can lead to bigger problems down the line.
For example, imagine planning a big event like a wedding. While the major decisions like the venue and guest list are crucial, it’s often the small details like seating arrangements, timing of events, or dietary restrictions that can make or break the day. In business, this idiom is often used to stress the significance of thoroughly reviewing contracts, agreements, or financial documents. Even the tiniest error in a contract clause or a missed decimal point in a financial statement can have significant consequences.