Deliberate "mistake": Series 4 Episode 13 Silencer.
When they are trying to find out who the blogger is, they back trace to the IP address the person is using, the IP address they find starts with 310, the highest number any octet of an IP address can be is 255.
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Quotes
Horatio Caine: Mac, I have a sixteen year old girl who is suddenly without both parents. I have promised her peace of mind.
Mac Taylor: I got an officer's widow who'd like some answers.
Mac Taylor: We got a deal.
Trivia
The was the CSI franchise's first crossover episode in which the purpose was not to introduce a spin-off. See more...
CSI: Miami (2002) - 2 mistakes in all of series 4
starring Adam Rodruigez, David Caruso, Emily Procter, Jonathan Togo, Khandi Alexander, Kim Delaney, Rory Cochrane, Sofia Milos (add more)
Updates: 
Series 2
All of series 4 (season 4)
Plot hole: Episode 419, "Driven". Delko pulls over Hayden early in the episode and questions him. Later on the shooter from the spa is found dead and he has glove markings on his arm. Delko tells Calleigh to compare the markings to the gloves he took off Hayden and they are a match. But Delko pulled Hayden over hours before he killed the shooter. If Delko had the glove in custody, how could Hayden have worn it during the killing?
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