They didn't fail to spot it at all, they knew exactly what they were doing, it gave immunity to all his co-conspirators including Dershowitz (Epstein's lawyer and alledged party to the abuses). Also, the victims weren't consulted and I would expect (hope?) that it could be negated (lawfags?). That whole plea deal was based off Epstein being a 3 letter agency asset whereby Acosta was told to back off…
That deal was nothing more than another coverup, no justice for the victims.