pirates of the caribbean: dead man chest disc flaw?

[kx11]

i was watching my lovley poc:dmc and when the kraken attacked the black pearl and noticed some strange flaws in the picture quality

same thing when you watch low bitrated mp4 movie when some square will vanish or freze


look at those 4 seconds of that

http://www.4shared.com/dir/4086118/eb4bc9c9/poc-2.html

by the way if you want to buy the movie go ahead it's awesome and has the best hd sound on blu-ray movie ever , it's just that after the aspect problem on poc 1 i thought i might share this with you and why did it happen on these movies only??