Continuity mistake: When Grisson gets on the vibrating bed, in the close up shots he is sitting with his neck even to the top of the headboard and no pillow showing. In the wide-angle shot, he's hunched down lower with a lot of the pillow showing above his shoulders.
Homebodies - S4-E3
Continuity mistake: When Brass and Grissom are interrogating the stoned nephew, shots of Grissom from the front show him with his head leaning against his right hand and then moving his hand down to the table, then it cuts to a shot from behind and his head is still leaning against his hand. This happens twice during the sequence.
Continuity mistake: When Grissom's car window is broken in the first shot where you first see the break there is hardly any glass left in the frame and yet when he is at the gas station there is an almost perfect circle of broken glass and a lot more in the frame.
Continuity mistake: When Catherine tells Grisson she liked the tough act (while listening to the guy testify) he said too much, she said not enough. Then he glances over at her. The guy is talking, which indicates a continuous line, even though the shot changes, but Grissom is not looking at Catherine during the shot change, instead he's got his head leaning against the glass.
Continuity mistake: When Brown talks to David, David pulls out a pelvis from a vat of acid, saying he's cleaning it. In one shot the pelvis is hanging off the lower of the tongs, but in the next shot it's clamped between the tongs. This series of shots occurs a couple times during the conversation.
Continuity mistake: Nick counts the bullet holes in the rabbit sign used for target practice and says there are only 9 holes. It shows a flashback to the guy shooting and he shoots a tenth hole in the sign near the rabbit's right arm. This hole is not shown on the sign Nick looks at.
Getting Off - S4-E16
Continuity mistake: When Jamal is been helped out of Ed Burnell's wrecked BMW 7 Series, the wrecked car is a late 80s-early 90s E32 model. However when Burnell was driving it at the beginning of the episode, it was a newer late 90s-early 00s E38 model. Again, the production crew couldn't afford to wreck a brand new car so an older one was substituted.
Continuity mistake: Sam's matchbox, in the interview room, changes from face-forward to back-forward several times.
Dead Ringer - S4-E20
Continuity mistake: When Nick is showing the burger guy the pictures from the ATM, he holds one up while facing the see-through window. He turns and puts it on the table and it's a completely different picture.
Answer: He doesn't have the authority to arrest him - when anyone is arrested in the show, a police officer does it. Also he tells Ty that he is going to be submitting his case findings to Ty's insurance company, who would no doubt contact the IRS, who then would have him arrested for fraud etc.