The Latin phrase "Tres nos salvabunt" on the carpet in the library translates to "Three will save us", which predicts the subsequent plot. The phrase was written by the voice director, Simon Nelson, who has a degree in classics.
During his fight with the librarian, Mitchell hits her with a book about Mahatma Gandhi, the renowned advocate of non-violence.
During the electrical storm, Becky tells the young Ernest Shackleton to get the other pupils to safety in the basement. Shackleton grew up to be a polar explorer who, when his 1914 Antarctic expedition went disastrously wrong, got all his crew to safety.