As an introvert I can tell you that most of the time anything in an interview will be flustering if unknown.

Tell them to pick a project or two and prepare to talk about it ahead of time of the interview.

Actually many of the issues I have with the current "standard" interviewing process is all about the fact that its a "school test" environment instead of a "prepare for a specific task" environment. The latter being what real work is actually about.