who?mikejones said:
That's what the bondo is for
LOL, sounds like someone else that has actual experience!

Actually turned out that for some unknown reason, one of my pocket doors had a bent nail protruding thru the pocket door frame only in the bottom corner about 3 inches from the floor and at the back end of the pocket. The nail scrapped a gash about 3 inches long and about a quarter inch deep into the door.

Never noticed any issue when the door was installed as I speifically check during the door instllation, but after a couple of years, it became quite evident as the door is painted black and the scratch marked area is an off white color.
I throught it was a nail from the base board, so I took a magnet to locate the nails in that area and removed them first to no avail as they were short and about an inch off from the actual scratch mark area. Then I thought it might be a sheetrock screw and I found it with the magnet and removed it as well, but to no avail as it too was short and off as well. So I cut a hole in the sheet rock in the area slightly above the pocket framing and wolla, there it was. A 16 guage nail approximately 2" long bent like it struck a metal plate and sticking out just enough to make contact with the door.

No idea how it got there...good thing was that when I cut the hole in the sheetrock, it was low enough that the baseboard covered it so no sheetrock patch work was required.
BTW, for patching nail holes, I use painters putty in lieu of caulk as it's much cleaner and easier to work with to get a smooth patch job done!