Immediately after Jack fires the crossbow while speaking on the phone, it cuts back to him continuing his line and the bowstring is still pulled back and cocked.
After the two groomsmen are brought in, the CSI's are shown examining evidence right in the questioning room. This evidence should have gone straight to the lab. The CSI's are also shown cutting pieces of the suspects shirts for samples while they are still wearing them. The proper method would be to have the suspects strip while standing on butcher paper to catch any loose particles, and then examine their clothes in the lab.
Arm of the camera crane is visible in the rear window of the limo when the CSI team find it.
In a flashback, two suspects flee the scene in a limo after they've killed a security guard. One slips in the back, the other one drives. But minutes before, they had been cuffed together and the cuffs don't come off until the next day.
After the dead man is removed from the limo, the Medical Examiner is shown scraping material from under the fingernails of the dead guy. As they are at the shore with high winds, he should have bagged the hands at the scene and scraped the nails back at the Coroner's office in order to not have any evidence blow away.