I was perusing trilobites on e-bay and came across this gem:
the seller makes no bones about the fact that it is a resin cast of a Phacops mortality plate. What is interesting is the level of detail of the cast, including individual lenses on the schizochroal eyes.
Most of the websites discussing trilobite fakes indicate that if you see details like terrace lines and individual eye facets, there is a very good chance that it is not a fake (at least those parts of the trilobite). This cast changes those rules, it seems.
In the close-up views, you can see bubbles from the setting resin (another tell-tale sign of a resin cast).
So, in conclusion...be watchful...the level of detail in resin casts has just gone up a notch.
---Prem