While investigating Noel's death, they discover a puncture mark from an epinephrine pen, used after an apparent allergic reaction to shellfish after consuming a drink containing pearl dust. Pearls are come from oysters and freshwater mussels, which are mollusks, not shellfish.
Horatio states mosquitoes are attracted to carbon monoxide, he is incorrect because humans exhale carbon DIOXIDE not monoxide.
While the diving knife is being tested, we see a bottle labeled "Peloxide, h202". This should be spelled "Peroxide" and the chemical symbol should be upper case "H2O2".
While the diving knife is being tested for blood, the technician touches the eye-dropper to the sample, thus contaminating the rest of the testing solution.
One of the suspects is a Third Grade teacher, yet she has the "ABC's" on her blackboard. Students learn the alphabet in Kindergarten, not 3rd grade.