The
IGN/Gamefaqs FAQ doesn't say that, but that's what I thought before I found the FAQ.
BTW, the unlockables
from the FAQ)
"By completing 30% of the game, you'll unlock an interesting option that
allows you to see the introduction sequence of the cases available in the
four previous games ("Gyakuten Saiban" 1, 2, 3 and the NDS version of
the first game). All of those come with improved sound, graphics and
animations, which is rather nice.
By completing 60% of this game, you will be able to see the ending
sequence of each of the four previous games, done by acessing the second
option from this menu.
Upon completing 90% of the game, you'll unlock a option which allows you
to see the "bad" animation of most characters,the one that is usually
shown when their crimes have been discovered. You can press the big button
to reset the animation and the arrows to change to a new one, but that's
all you can do.
When you (finally) get to 100%, the last option will be unveiled. By using
it, you are able to see every special scene contained in the four games,
the rare, anime-like, images which usually show how a crime went or depict
important scenes that during the case."