level 16 has been omitted because it relies on glitches only present in DOS.
I can confirm this level is possible to solve, unmodified (except for removing the steel areas and using Autosteel instead), in both V1.43n-F and the latest experimental version from Nepster. Obviously, the solution is different from the original one (though fairly similar). Replay for V1.43n-F attached; the solution is the same for the experimental version though the exact replay likely won't work due to subtle differences in timing. Considering that this solution
is very similar to the original one, I don't think the slight difference is enough grounds to justify excluding it, unless Mazu himself has said it should be for this reason.
(EDIT: There are at least two other solutions that work in NL too, although they're just slight variations of this one.)
Yeah Namida is right I remember there were two other levels that never made it into the actual 30 level pack.
At least one of them was in there originally; back when I first played this pack it was Level 15. It was replaced at a later date.
EDIT:
The two removed levels can be found here:
http://lemmings-db.camanis.net/levelpack/ag1zfmxlbW1pbmdzLWRichYLEglMZXZlbFBhY2sYgICAgIXYlwkM/Looking at them now, these two were definitely both in there back when I first played this pack. "Lemming Come Back!" is the one I was specifically referring to earlier.