Character mistake: Horatio writes the symbols for sulfuric acid, H2SO4, on a clear board. Both numbers should be subscripts but he writes the 4 as a coefficient (which precedes the name of the acid but he writes it after), suggesting a lack of basic chemistry knowledge.
Character mistake: Natalia professes not to know why the Statue of Liberty is green. The hue is the result of the natural oxidation of the statue's copper skin, a chemical reaction it's impossible to believe the crime lab's resident expert in chemistry doesn't know.
Character mistake: Horatio twice reads an extract from a letter threatening the life of the poisoned woman. The first time, he reads, "If you ever try to contact us again we will kill you," and the second time, "If you ever try to contact me again I will kill you." A close up of the letter shows it to read, "If you ever try to contact me again i'll (sic) kill you".
Character mistake: In the episode with the airplane murder they claim that oil is heavier than water, which isn't true under any circumstances. Oil is less dense and consequently lighter than water.
Character mistake: When Calleigh is with the medical examiner, she says that "Togo" is holding down the scene at the hospital, stating the actor's actual last name instead of Wolfe, his character name. (00:08:25)
Character mistake: While discussing the death penalty with Mac, Horatio observes that New York hasn't executed anyone since 1976. The last time New York executed an inmate was actually thirteen years earlier, in 1963.
Answer: Earlier in the episode, Horatio tells Mac that Penrod was seen in Tribeca getting his leg set, only to bolt when he learned a nurse wised up the cops. Caine and the NYPD probably got Penrod's address from the hospital.
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