Yup on the closed-looking door.
Also VERY yup on the temple being pretty bad overall, and the OP mentioned section in particular... it absolutely makes no sense at all, and reeks of 'what the...?' rather than 'I cleverly solved this!' (I used a guide btw)
As for the mine, also in agreement... after combing the entire mine, I finally got told I needed the peeps there. So the awkwardly find a point to teleport over game began, and I found one... only to learn somewhat shortly after that those rocks where destroyable... from the start! So much pain I could have avoided

EDIT:
As for TZDZ's mentioned location, I also did use teleport there finding just the right location that was very hard to mark.
Anyone wanna spoil me what the proper way was. I suppose a door seeing the path leading back to the wall, but I couldn't detect it...