Keep an eye on Prince Gio's scar. It keeps changing its shape.
After Jim says "they're gone" in the opening scene, Artemus responds with 2-3 words spoken softly, but nothing is heard.
The explosion of the door is mistimed. The door panels blow into the room. The the smoke of the blast.
Contrary to what is said during the show, Albania was a province of the Ottoman Empire with no independent national status. Nationalist movements arose in the late 1800s, culminating with independence being declared on 28 November 1912 and internationally recognized on 29 July 1913.
At the 53 minute mark during the fight between James West and Prince Gio, West is thrown over Gio's shoulder and the scene cuts to West landing. A large cushion can be seen through the hole in the floor which is obviously not supposed to be seen.