As part of a marathon process, you meet all the relevant company interlocutors over a half-day or a full day. This ranges from the three conventional interviews (HR + direct superior + director) to a dozen in the case of large companies.
Not adapting to each new interviewer: if you stick to a standard speech, you are forgetting that each person is interested in different things.
Showing weariness: even if you often repeat the same thing, demonstrate freshness and availability in all your interviews.
Being complacent: so your interviewers tell you that your application interests them and that you are going to meet the CEO? Remain on your guard. While nothing is signed, nothing is certain.
This is either a time-saver (several decision-makers are present) or a second step in which you meet your direct hierarchical superior and his boss (product manager and marketing director, for example) or the whole team.
Switching off, as you think that the group is a friendlier proposition than the face-to-face duel.
Focusing on a single interviewer: for example, avoid looking only at the financial director even though he may have asked you a question about the sales cycle in your previous company. The sales director may well also be interested in your answer.
Forgetting names and positions: at the beginning of the interview, note down the names and positions of your interviewers in the order in which they are sitting. Don’t hesitate to ask them to repeat themselves if you don’t understand a name.