Although the show features games held in a colosseum, the ancient Greeks did not have such forms of entertainment. The Romans invented the Colosseum basing the architecture on Greek theatres, though vastly changing the purpose. Greek theatres were used for plays, not killing.
Mark Lewis Jones, Sarah Parish, Alexander Siddig, Frances Tomelty, Donald Sumpter, Karl Johnson, Julian Glover, Michael Jenn, David Sterne and Gemma Jones also acted in Merlin (2008) which was made by the same producers and writers.
In Greek mythology Ariadne never meets Jason. They are from different myths. Ariadne helps Theseus against the minotaur and Jason sails on the Argo
In Greek mythology Ariadne is in fact Pasiphae's daughter rather than stepdaughter as is portrayed in this.
In January 2015, the BBC confirmed that the third series, which would have been inspired by Jason and the Argonauts, was not to be commissioned, and on 16 May 2015, the series ended.