I do know what the slats/flaps should look like on the aircraft I fly on most often, and, when it is normal practice to have them deployed.
If, in normal circumstances, we were approaching the hold and I could see no such settings, then that would make me very worried indeed.
Making a cabin insecure would be not very high on my list of concerns.
A Robin I flew occasionally for leisure some years ago had leading edge slats - they'd retract on the take off run, quite normal and harmless but still a tad disconcerting.