Nucky's ledger disappears from his hands between shots.
As Dale Carnegie became famous, he changed the spelling of his last name from "Carnegey" to "Carnegie" (around 1922). When Elias shows Nucky a pamphlet for a course he has been taking on public speaking, the pamphlet has the "Carnegey" spelling. As the show takes place in 1920, this spelling is correct.
Only renamed "Public Speaking and Influencing Men In Business" in 1937, Carnegie's book was not written until 1926, originally titled "Public Speaking: a Practical Course for Business Men".