In order to meet an early shipping deadline for a U.S. release of September 30, many second-playthrough extras present in the subsequent Japanese and European release of Ico had to be cut. In addition, several changes were made to the castle's rooms and puzzles. The following is a list of all revisions made after the release of the U.S. version of Ico, including missing bonuses
Yorda's speech translated
In the initial playthrough of Ico, Yorda's speech would appear as runic symbols on the bottom of the screen. On a new game started from a cleared game file (referred to as a "second game"), Yorda's speech is translated.
After starting a second game from a cleared file, a second player can play as Yorda (by adjusting a new "Players" setting in the Options menu).
A new option that allows the player to select from various film overlays, making the game look like an old film (The overlays are used in various parts of the regular game, including the early cutscene where Ico sees a shadow dripping out of Yorda's cage).
At the end of the game, Ico walks down a long beach to meet Yorda. If this is a second-playthrough file, several watermelons will be behind a large rock near the beginning of the path (the boat "points" right towards it). If Ico picks up one of the watermelons and carries it all the way over to Yorda, an extended ending will play showing them sitting together eating watermelons on the beach.
Changes made to the castle
Click to enlarge.