I did notice when I was doing the Abby meta just how many occasions they sacrificed character continuity to the needs of the plot. Not so much in the first couple of series, but certainly in series three I seem to remember there were some particular WTF moments that made no sense in light of previously well established character behaviour.

It's a shame, because way back in 2007 when series 1 first aired, I was drawn to the show by the promise of dinosaurs, but stayed with it on the strength of the characters who I rapidly became very attached to.