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In chapter 21 Vittoria states that "everything has an opposite. Protons have electrons." Protons and electrons are NOT opposites. The opposite of a proton is an antiproton, the opposite of an electron an antielectron (or positron). Other than having opposite charges, a proton is completely different from an electron, ie. a proton is a hadron made from 3 quarks, Up Up Down, making it a baryon. An electron is a first generation lepton and is a fundamental particle. As a physicist, Vittoria wouldn't make this mistake.

Claudia and Jamie stay in one of the museum's beds while hiding out in the museum. The card at the foot of the bed claims that the bed itself was the "scene of the alleged murder of Amy Robsart, wife of Robert Dudley, Earl of Leicester". Except that Amy Robsart was killed when she fell down the stairs in her house - nothing at all to do with a bed. The Metropolitan Museum would have done some research into that.

The author says that the real Scottish king, Macbeth, died in the year before the Battle of Hastings in 1066. But Macbeth actually died in 1057.

When Mulch helps Holly and Artemis from the trunk of the car, when they've gone back in time, it says that he burps. Yet in the first book it says that all dwarf wind is passed down, soMulch is incapable of burping.

The whole premise for Taylor's being forced to go on the lam with her daughter is that she doesn't have anywhere to go - she can't go to her mother Alice's, since Alice is leaving her husband (i.e, Taylor's stepfather) and so this seemingly makes that house not an option. But it's stated specifically that it's Alice's own house Harland moved into - so it makes no sense at all why Alice can't either go back to her own house, or kick her soon-to-be ex-husband out, or have Taylor share the house with her soon-to-be-ex-husband. It makes no sense except as a plot device.