Discordian (or anybody else for that matter),
Have you ever asked either of the first two questions? What were the results? While most reputable interviewers would probably give a honest answer, I can just imagine the made-up answers and/or the proverbial "no comment" also given.
("The reason the last person left was because they were fed up with the incompetency here. We normally can't keep anybody in this position for more than six months. Sooooooo, when can you start??")
Sometimes it's a matter of reading between the lines, and other times, when the interviewer gives a noncommittal answer, you just have to move on to the next question. If an interviewer responds by saying, "I really can't discuss it due to confidentiality concerns," you have no way of knowing whether the response means anything or not. The question is still worth asking though, because once in a while you will get an honest answer. A candid reply is more likely in an upstream interview with a department head; an HR screener isn't likely to give up the information, and depending on the circumstances, might not even know the answer.