The man who falls from the building went out and purchased a $30,000 watch. When they show the movement inside the watch it is a Japanese quartz movement valued retail at the most $45.00. Not the kind of movement found in a watch of that cost. The movement would most likely have been either Swiss quartz, or mechanical.
When Holly struggles with her assailant she has gloves on, when she scratches him you can see she still has the gloves on but the two middle fingers have broken through. On the next shot she is holding her right glove in her hand, but in the following shot her glove is back on and the middle fingers are covered.
When Grissom uses the sprayer on the balcony, he fills it to a quarter, then is shown from behind with a more than half-filled sprayer, then again frontal with a quarter-filled sprayer (at 0:36:50, blu-ray time).
Grissom says they do not want an Internal Affairs (IA) investigation. Such an investigation is standard procedure when a member of an agency is killed while on duty.
Vegas hotel rooms don't have opening windows or balcony doors.
Holly Gribbs' firearm is a Glock 23 (.40S&W), which can only use a double-stack magazine. However, when a CSI examines the magazine from that firearm, she is holding what is clearly a single-stack magazine from an M1911 (.45ACP).
The DNA is taken from the suspect clearly with no consent or a warrant being shown. It would be inadmissible in court.
When the guy who shot Holly Gribbs gets arrested, Sidle says "for a conviction we need a DNA sample." Another scene showed Catherine obtaining evidence under Gribb's fingernails but if you go back to the scene leading to her scratching the attacker and getting shot, she was wearing gloves. While Gribbs was wearing gloves initially, in the flashback towards the end, Gribbs is shown on the floor holding one of her gloves, so she took it off at some point.
When the woman is dragging her boyfriend to the balcony, the view is gone, replaced by the original green screen used during filming.
When Grissom and Nick are looking at the wrist of the fallen millionaire, you can clearly see the eye lid of the millionaire moving and twitching when the camera leaves the shot of his face.
When the shard of glass is extracted from the body's arm on the exam table, you can see the dead body's stomach moving, as the actor is breathing.
Grissom says they are not detectives, yet here and throughout the series, the crime scene investigators are shown doing detective work such as questioning suspects and telling people they are under arrest.