No teeth were blacked out for Dante as Tempus when he re-entered the castle after the Stormers attack.
The wrong tooth has been blacked out for Dante's disguise as Tempus. This is the first of many make-up mistakes with his teeth during Season 2.
During season 1 we are led to believe that Dante is a member of The Shadows which would mean that his tribe has been on the island since 1843. This is however contradicted in season 2.
In all other episodes The Old One's refer to each other as Number 1 and Number 2 and by others as Captain Smith and Commander Jones. Except in this episode where Jones is refered to as Captain Jones.
This episode had no introduction.
A steam-ship named the Hispania did indeed sink. On the 18th December 1954 the Swedish ship Hispania sank.