For the SMP:
Flaws/tells are mainly pearl (easy fix), case back, bezel numbers&indices (engraved, not flush as the gen and slightly thinner). Also the hour indices are not as flat as the gen. The rep is also slightly thicker than the gen. But except for the pearl, I'd say all those are passable unless you do a side-by-side comparison.
Common errors I've seen are are bad bezels (uneven spacing - 12 and 6 markers don't line up) and misaligned date wheels.
Also currently they only come with "Swiss ETA", which is a bit of a lottery. Mine came with a movement that's either very old or very "franken" based on the looks of the regulator markings. But it works, so...
Apart from all that it's still a very nice watch, and my current daily beater.