In between the end of the Farscape series and the Peacekeeper Wars, Pilot's voice changes. But if you check the credit it is the same voice actor, 'Lani Tupu'. (Tupu is also the actor who played Captain Bialar Crais.)
The peace of crystallized organic material that is Aeryn and Crichton's baby, which stayed inside Rygel, has never gone thought the decrystallizing machine. Nevertheless it started growing, and Rygel's stomach acids did not harm it, but it was established earlier in the series that Rygel's stomach acids are not the same fashion as others, which could mean it could be conducive to not only restoring the baby crystal, but nurturing it as well.
The Eidelon priest told Aeryn that at the dawn of their usefulness 27 thousand cycles (about 27 thousand years) ago they found a primitive and barely clothed species, humans, which they genetically engineered to make peacekeepers. Crichton found an artifact near the Eidelon temple on Arnask (ep.402 "What Was Lost") with an Egyptian hieroglyph. The Egyptian hieroglyphs are dated 3200 b.c, about 5.2 thousand years ago, there were no Egyptians 27 thousand years ago, nor there were Egyptian hieroglyphs. This might be explained if the hieroglyph seen in "What Was Lost" - the eye of Ra - was introduced to primitive Earthlings by the Eidolons and re-surfaced in Egypt millenia later, rather than supposing that it originated on Earth first thousands of years after the Eidolons' visitation. It would also mean that the "barely clothed" species may have been a species of proto-human, which would mean that the Sebaceans are not entirely human, but close enough related to result in an offspring being possible.
At the end of 'Bad Timing' when Aeryn and John were transformed into crystals, their pulse pistols are clearly visible in the pile (the pistols had not turned into crystals). However, when they were reconstituted at the beginning of 'The Peacekeeper Wars' the first thing they did was pull their guns which were, supposedly, still in their holsters.