David Tennant's characters seem to act as muses for William Shakespeare in both productions. Also, Mr Young's car has the number plate S1D R4T which is Tardis backwards.
The series title is a pun on that of the Omen and follows the adventures of a child antichrist and his hell hound, which turns out not to be a rottweiler
The title is a play on the Omen franchise, and it also tells the adolescent struggles of the young antichrist, who doubts his mission, and is supposed to be the son of an American ambassador to England.