When you first see the women by the telephone pole, her left arm is around the pole, however, in all future shots of her, it is the right arm around the pole.
When the artist is first being interviewed by Brass in his studio his headphones switch position between camera shots. Close up they are twisted round so the band is in front of his throat; when Brass is also in the shot the earpieces are either side as if he's just removed them from his ears.
When Jeffrey Tambor says "The party was five years ago", he folds his arms across his chest but his arms change to his hands being on the table in between shots.
When Brass holds out the photos of the two dead guys towards Jeffrey Tambor Jeffrey Tambor when they're at the craft services table at Tambor's art studio, Brass has the photos in his hand with his arm outstretched but his arm changes positions in between shots to where the picture is closer to his body.
Zolpidem is a Schedule 4 substance available only via prescription. It isn't found in *any* OTC sleep aides (let alone "most").
When the CSI crew is going to find the child, they know they're heading to a place where carbon monoxide is being used to kill people. Yet, they don't alert paramedics, they don't even take any oxygen. Treating carbon monoxide poisoning with oxygen is First Aid 101. Truly professional CSI people would never make such a bonehead mistake, and would make sure paramedics were en route to the scene before they even headed out.
At the end of the episode when the police go to find the child, as the police cars turn they all have Nevada plates, but the CSI Yukon has California plates.
The character of Riley Adams performs CPR on the child as you would an adult, and would therefore break his ribs, on a child your only supposed to compress the chest for approximately 5cm.
At the crime scene with the woman in the park, Catherine touches the victim with bare hands, possibly contaminating evidence.