Blooper: When the companions have made it to the top of the tower, the boy runs to the edge and says something that doesn't get translated. One might assume it was an oversight.
Creator Backlash: Even though its clear from gameplay footage the giant baby griffin and boy care about each other very much, Team ICO are not happy to comment upon the relationship between Trico and the boy. Stating its up to the viewer, the audience, to interpret whatever they wish beyond their hostile-first-meeting.
In part, these delays are a function of Ueda’s uncompromising vision and unusual directorial process. When he is working on a new game, he begins by creating a mockup short film, which gives his team an impression of the feelings he wants to elicit but doesn’t get into technical details...Sony, for its part, indulges Ueda’s perfectionism. When asked, in 2015, whether the company would like to work with him on another project, Shuhei Yoshida, the president of Sony’s Worldwide Studios, said, “Everyone would."
Dueling Games: With Microsoft's Scalebound. Both are games involving human protagonists accompanied by giant monsters set in a fictional world. Both are to be released in 2016 exclusive to the opposing console.
Subverted, as Scalebound ended up getting pushed back to 2017, then was unceremoniously cancelled early that year.
Jossed: Early in the game's development, Word of God said that the ending would be sad. This led to people speculating that either the boy, Trico, or both would die. The final game disproved all three, instead being a Bittersweet Ending.
Progress was incredibly slow, featuring several false starts, with Fumito Ueda announcing that he was leaving Team Ico (though committed to finishing it via contract), and false news of cancellation due to a lack of information. For context on just how long it spent in development hell, keep in mind that the game started development for the PlayStation 2.