In a written Torah, there are two upside down nun's - one before Bemidbar 10:35 and another after Bemidbar 10:36.
When the Sofer writes this, should the tagin ("crowns") be placed on top (i.e., inline with the tops of the surrounding letters, which in this case would be on the bottom part of the nun), or should he place them on the bottom (meaning the "head of the upside down nun, as if the nun were written the normal way?)
The one I used this Shabbat has the tagin on the top - inline / parallel to the surrounding letters. I think this incorrect. If the nun includes the tagin, then if the nun is upside down, the tagin should be upside-down as well. I.e. flipping the nun, includes a flip of the tagin.