As Grissom is rifling through the suspect's mail, he remarks that the envelopes are "postdated" more than a year ago. He should have said, "postmarked," as Willows says correctly about 5 minutes later.
Grissom mispronounces the word "pica" (saying 'pea-kah instead of 'pie-kah) when talking about the eating disorder with Dr. Robbins.