Most shows depict liquid nitrogen with CO2 fire extenguishers. After the hoseing of the parasites, Aeryn steps on some frozen/crunchy bugs. Look carefully beside her boots for little, shiny, liquid beads rolling and smoking on the floor. Those are drops of liquid nitrogen floating on their own by the Leidenfrost effect.
Crichton's golf scene at 3:10 is an homage to Bill Murray's "He's a cinderella boy" monologue in Caddyshack, when Murray's groundskeeper is chopping the heads off the flowers with a golf club.