"Warning signs" that candidates should be aware of during an academic job interview I know that a big part of academic job interviews is for the candidate to evaluate whether they want to be in the department (not only whether the department wants them). 

Are there some non-obvious general factors that signal a possibly dysfunctional department, or an otherwise undesirable position, that a candidate should be aware of? For example (but not limited to), is a poorly attended job talk, or only meeting a relatively small fraction of the faculty, a warning sign of something awry? 

I'm asking this question because I have had two successful interviews and am weighing competing offers. This has left me considering some of the finer aspects of the interview experience.
One thing to consider is tenure rates. Some departments are much more difficult to gain tenure in than others. My undergrad institution is well known for tenure cases that end in litigation. Similarly, I am aware of a department (small liberal arts college, not MIT or the equivalent) that denied tenure to something like six assistant professors over the course of a decade without granting tenure to any of its hires.

Additionally, it's worth considering whether the department has autonomy over the hiring process. If the meeting with the dean is not largely a formality, this might be an issue.