Factual error: Britons will be grateful to know that it would be impossible for the UN to order the nuclear destruction of Great Britain. The UK, being a member of the Permanent Security Council has the power to veto any UN decision.
Continuity mistake: In section 12 of chapter 11, Henry thinks about how "He, Pete, Beaver and Jonesy's wife had kept a secret among them", that Jonesy's "heart had stopped twice" after he was hit by a car about 10 months earlier. This is a mistake because earlier that day, in section 8 of chapter 3, Pete hadn't known about it - Henry tells Pete that Jonesy's "heart stopped in the ambulance", and Pete is shocked to hear it.
Factual error: In chapter 8, Barbara is thinking about bullfighting, and how she had seen the horses being disembowelled by the bulls. But Barbara didn't arrive in Spain until 1936, and since 1928 horses used in bullfighting have been legally required to wear protective padding that prevents them from being injured by the horns (so the horses can be reused in other corridas).
Plot hole: It is revealed in the book that Melancholia's reflection is killed instead of Melancholia to cover their tracks. But reflections are frequently described in the book to be able to be spotted by sorcerers "a mile off." And yet not one Sanctuary Agent or the cleanup crew notice and alert the Sanctuary or Skulduggery.
Factual error: During Soneji's trial in part four, the prosecuting attorney objects when the defense asks Cross a leading question. Since Cross was called by the defense as a hostile witness, it is legally permitted to ask him leading questions.
Continuity mistake: In The Bridal Dance and And About Time Too, Will checks himself in the mirror, although later it says he can't afford one.
Factual error: In chapter 9, 1941 during world war II, Chuck Dewar is stationed in Hawaii where he windsurfs, although windsurfing was first invented 20 years later (in the 60s).
Factual error: In Chapter 14, Cato is being awarded a grass crown for saving his centurion and the standard of his company. The grass crown was only given to generals or other higher officers, for rescuing an entire legion or army, and it had to be acclaimed by the entire legion he rescued. As an optio, Cato would be ineligible for a grass crown, his actions would not qualify for it, and he is said to be unpopular with his company, so a unanimous vote is highly unlikely.
Plot hole: In chapter 19, while talking about Leah Rose, it is stated "She and Rayford had spotted the seal of the believer. Otherwise she might have never given him the time of day." Fact is, when she is introduced in the series, it is Buck whom she meets and they notice the mark of the believer on each other's forehead. When she meets Rayford much later, they both already know each are believers.
Continuity mistake: When the Kingdom Keepers are inside the It's A Small World attraction, and the puppets come to life, the book states that a doll locked onto Finn's arm, chomping down hard enough to draw blood. However, at the girl scout car wash, Finn shows Amanda his bite marks by lifting up the leg on his shorts.
Other mistake: In the hardcover edition, published 2008. The mistake is on page 100 - "And when did faux mitzvah enter everyone's vocabulary accept mine?". 'Accept' should obviously be 'except.'
Other mistake: In the Freddie Fear comic near the end, all of the speech bubbles in the last page of the story are missing, even though it's obvious that people are talking.
Factual error: The main character, a WWI U-boat captain, mentions his vessel as having chemical air regenerators, an underwater airlock for divers to leave by, and of course dive suit(s), but I don't believe such craft of that era had any of those.
Continuity mistake: After the "adventure in acceleration" at Adrian, the Hail Mary is effectively upside down (Ch. 20). Then Grace gets "sick of living in the Poseidon Adventure" and rights it-meaning the storage area is at the bottom again. He goes in there to fix a leak, then "climb[s] back down and wince[s] the whole time." He should be climbing up or out, not down. Also, in Ch. 22, when Grace is in there again (finding Taumoeba poo), "Rocky calls out from below"-but Rocky should be above him, not below.
Other mistake: When Eliza is talking to Midas at the July 4th party, in response to her question the text reads 'Marcus chuckled' instead of Midas.
Other mistake: On page 197 the author writes "Margaret opened her eyes to sickly dawn...the clock read 6:45 p.m.". PM would be sunset, not dawn.
Continuity mistake: In the second chapter it states specifically that Lillith is texting on her iphone however after receiving a text from a friend she says she closes her phone or snaps her phone shut suggesting that she is using a flip phone.
Continuity mistake: In the first chapter, when the Thunderclan hunting patrol meet the Shadowclan border patrol; the Shadowclan cats taunt the Thunderclan cats and Birchfall jumps on Snaketail. Snaketail's apprentice Scorchpaw then jumps on top and Hazeltail joins in to help Birchfall. It says: 'Hazeltail launched *himself*' but it says in the Allegiances section that Hazeltail is a she-cat.
Continuity mistake: In the epilogue, when Chad is speaking in court, Sharon's attorney says that Ann's mother died "'last year'". During the flashback in chapter three, when the group is at the river before hiking to the cliff, Ann's mother is described as having died "a couple of years" ago.
Factual error: The geographical issues begin about mid-way through with the characters at Glacier National Park in Montana for a wedding. When everyone begins to leave, Nick is taking the scenic route back to New York via car. Harper is getting a ride to South Dakota to catch a plane. The scenic route in Montana is Hwy 2, which the author labels as US Route 2 (technically correct but Montanans call it Hwy 2). Continually talks about 2 lane roads. Yet the next location the car stops at is Sleeping Elk. Higgins has them spending the night there. Sleeping Elk is a smaller than small town that is by the Interstate which entails getting off another Interstate to make the connection. Sleeping Elk has no motels and is less than 10 minutes from Bozeman. Higgins makes it sound like they are in the middle of nowhere when in reality, they are not. Also never mentions the passing by of other large cities including the state capital but rather mentions the smaller cities that are on Hwy 2.