Good question. I dont have a link to specific claims which are probably pretty complicatedbut definitely NOT just basic things like being thin rectangles.
Samsung truly has copied Apple really blatantly time and time again, undeniably leveraging Apples designers to prevent the time/expense/risk of doing their own work from scratch; and whether thats legally significant or not (seemingly it is, sometimes) there are some links showing that. For starters:
http://photos.appleinsider.com/samsungvsapple.081911.jpg
http://dcurt.is/chromebox-samsung (very recent!)
http://www.idownloadblog.com/2011/09/29/apple-samsung-copycat-2/
Another thing to remember: look at all the other tablets that do NOT use Apple styling. Apples way is not the only way to design a tablet, or a charger, or a UI, or packaging, etc. etc.
Given the number of lawsuits, was this one definitely on "look and feel"? Beyond that, the phone and tablet photos are lacking context. They had other designs beyond those shown. The photo includes a lot of flip phones that were basically given away during their respective eras. On the tablet thing, I'm wondering what year that was made. It looks like one of those ancient Windows CE devices.