In the Italian dubbed version, Brad Pitt's voice was changed from his usual one (Sandro Acerbo) to the voice of Loris Loddi, who usually dubs Val Kilmer. Wolfgang Petersen personally chose Loddi.
(at around 17 mins) The caption "Mycenae" appears with a sea inlet in the background. Mycenae is inland and the sea cannot be seen from any vantage point near the city (ruins).
When Patroclus is fighting Hector in Achilles' armor, Hector stabs him hard in the chest, which would make a hole or a least a cut in the armor. When Achilles goes to fight Hector in the same armor, no marks are visible.
During the sacking of Troy, Glaucus yells that they'll make "the boatman" wait longer -- what is he talking about?
A
The boatman he's talking about is Charon (or Kharon), the ferryman who brought newly dead souls across the rivers Styx and Acheron to the underworld, ruled by Hades. Charon famously made an appearance in Clash of the Titans. More about Charon can read here.
Q
What are the differences between the Theatrical Version and the Director's Cut?
A
A Director's Cut of Troy was created for the home cinema market that features more than 30 minutes of new footage. Most of these scenes are plot extensions or only prolonged frames lasting for a couple of seconds. Sometimes alternate footage was used and several fighting scenes got a bit bloodier in the Director's Cut as well. On top of that some more nudity is included in the DC, too. A detailed comparison, split in two parts, between both versions with pictures can be found here (Part 1) and here (Part 2).
Q
Will The Odyssey be made into a spin off of this movie?