As Valiant approaches Ilene's dead body he throws the sword. The sword was supposed to be facing away from Ilene. Instead in the next shot it was pointing towards her.
50mins in. Prince Valiant washed ashore wearing a full suit of chain mail. that weight would have dragged him to the bottom.
When Lady Ilene is first introduced into the harem, they tell her that she's Thursday. She says, "That's today," but her mouth says, "That's tomorrow."
At 55mins in, sailing from Britain to 'thule' is weeks. not minutes or hours.
At 55mins in, sailing from Britain to 'thule' is weeks. not minutes or hours. and she would not have been left in her armor.
In the strip, Prince Arn was actually valiant's son.
When the "Vikings" were in the Round Room, about to steal Excalibur, the Round Table knight that came in to confront the raiders said, "Which of you Vikings wants the first dance?" despite of the fact that all of them were clad in Scottish tartan.