Don't Eat the Snow in Hawaii - S1-E1
Continuity mistake: When Magnum drops the ring out of the envelope, nothing is near it as it's shaking. In the close up shot, it's next to keys. (00:44:20)
Continuity mistake: When Blackthorne tries to open the door in order to leave the room he woke up in, his hand tears the paper wall. The damage to the paper then changes between shots. (00:11:20)