I always wonder why, when it comes to legends, we rarely gets something out of the ordinary. After all, mixing stories from other is easier than making our own stories.
In eps 4, we got one of the classic of the greek mythology : Prometheus, the god who gave fire to human. But, instead of the original name, we got the name Myrddin, which is a figure in medieval Welsh legend.
About Prometheus :
http://en.wikipedia.org/wiki/Prometheus
(I knew about this god since secondary school, since I had the homework of searching on this legend. Greeks really were mad, when it come to legends.)
As for Myrddin, which you can get some info here :
http://en.wikipedia.org/wiki/Myrddin
"Now, I shall proceed to get drunk myself" (eps 4, 21min15) sound a bit... unusual and a bit too formal... Have you ever concidered saying this? O_o"