Cassandra describes Enochian as a mathematical language based on Greek and Hebrew. It was invented by two Elizabethan mystics who claimed it was the language of the angels. While mystics and writers are fond of Enochian, linguists generally regard it as an uninteresting fake language based on English.
Most folks think Arthur pulled Excalibur from the stone. In some of the ancient legends he did; however, in other versions, the sword in the stone is unnamed and later is given to Arthur by the Lady of the Lake.
The piece of music Flynn and Eve dance to at Buckingham Palace is Salut d'Amour, Op. 12, by composer Edward Elgar.