I'm interested to know whether those jobs where you have people applying without addressing the person spec, directly ask people to do so.
It seems obvious now, but I remember as a young un being told to write something in either my CV or cover letter for every statement in the person spec and it being a revelation. I wonder if it should be made clearer to candidates (completely understand that some candidates don't read the instructions!)
Some jobs have a table where each essential/ desired characteristic has whether it's being assessed at application, interview or something else (if there's another part) which also helps.
My 'don't' advice is, when invited to phone up for a chat about the job, don't call up and say, "I want to get the inside scoop to see if this is somewhere I actually want to work or if it's a madhouse" and then at the end of the call, ask "do I actually have to apply now? I've already told you about my experience"
Especially if you're applying for a job IN RECRUITMENT
If you're sent an email that says there's an attachment with a task for interview. Open the attachment and read the task, to see what it is and in particular, if it's a request to prepare something in advance or you will be very embarrassed when you're asked to begin your half hour presentation and you don't have one.
This happened to someone I know, the interview panel was very nice about it but it was apparently the most excruciating conversation!