I basically knew that but had never confirmed it properly.
Taxing 13 has one or two stalks that you have to bash through near the exit, and I've not played it on the DOS version to confirm or deny whether it has the same problem (from the screenshot, it
looks like it doesn't. But remind me, does it take 6 or 7 pixels to block a lemming from jumping up?). But then the DOS version has the miner/one-way arrow bug, so you win some, you lose some. Mayhem 26 may well be the only one that you ever
hear about. Plus, most levels have more square bricks – it's only really that tileset that has a lot of places where it'd be affected.
One thing that's annoying is that you sometimes can't tell if a lemming will fall through something or not. Take this screenshot of the no-builders solution for Tricky 11, which I completed a few years ago. It took me quite a while because if the miner is like one pixel further to the right, the lemmings fall through; yet there's still an unbroken line of pixels (presumably, one group of 4 pixels isn't counted as a whole one or something). It becomes unambiguous only if you view it with the old lo-res graphics*
Also, the only other level I can think of that was affected by the graphics is Havoc 16, the screenshot for which I posted somewhere else. Basically, this is because the designers of the level got a rock shape and filled in the gaps to make the wall straight with other rock pieces. On the Mac they're rounded in such a way that the rock shapes don't fill each other's gaps. What I would have done would be to take a straight piece like a metal or crystal block and make it black in order to make a perfectly straight wall.
*It's also worth noting that upon coming up to two blocks that are only just touching at a corner, like this:
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***--
***--
a lemming walking along the left hand block will fall through the gap. I actually only discovered this recently because it's absolutely not clear at all on the Mac...
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Edit: thought of another example of a difference, although a minor one: on the type of spike that I've attached a picture of, lemmings will turn around at that little notch on the left in the DOS version but will jump up onto it on the Mac version (they still can't climb over it entirely, though).