The most common mistake is to think that every employee of a company that is known for a breakthrough or a specific project has implemented this very project.
Case. An industrial company was planning a transformation and was looking for a leader to the board of directors who could improve operational efficiency. One of the candidates was a director of operational efficiency well-known in the market, who was invited for an interview thanks to a highly successful project. However, during the interview it turned out that he "picked up" the project, and the idea itself was developed without his participation. Of course, this experience is not relevant to this board of directors.
You need to look for a person who really was the ideologist of changes. And it is not always the one who was directly involved in the launch. It is important that a person, having heard an idea, can make it work.
You can check the role of the candidate in the implementation of the project by asking a number of questions: What was the task? Who owns the idea? What steps were taken? What was your role in this project? How do you assess your role in the project? What conclusions have you drawn? and etc.
The second option for checking a candidate is through recommendations. You should contact several colleagues who can confirm the information. It is important to collect recommendations not only from top officials, but also from those who worked / are working with the candidate in parallel and under him/her.