Exposing too much of the internal state. Frame the concept in practical terms so you can explain it during interview discussion.
A common mistake in encapsulation is exposing too much of an object's internal state, often through direct field access or excessive use of getters. This can lead to unintended dependencies and makes it difficult to maintain object integrity. Instead, design methods that perform specific actions, such as `increasePrice(double percentage)` in a Product class, to manage state updates safely.