Shrek Forever After picture defect?

[Leonidas King]

Not sure if I have a faulty copy but at the 0:23:02 mark there is a slight dark artifact that shows long the hay outside (to the left) just when Shrek is about to exit the destroyed swamp. It's pretty noticeable and distracting. It's only visible for less than a second though. But I thought it ruined an overall reference quality BD.

Anyone who owns a copy can confirm this for me please? Maybe all produced copies have this. Thanks.