I think this is a duplicate, sorry if it is, but I could NOT find any report that covered this.

Torches (coal and redstone) will NOT show up in item frames. Tested in Creative and Survival. They're there, but not visible.

This is on fast graphics.

You can place them on the same block as the item frame, and they'll stick through it, but you can't make them appear in the frames.

EDIT: Looks like all items are the same way! Screenshots coming soon!