That's silly: it was introduced as evidence in a trial. How it's perceived in the public is not relevant. The other party has its chance to refute whatever Apple says in court.
How it's perceived is the very root of the issue. You can take the document two ways:
1. Samsung drew out a document studied the iPhone. That's perfectly legal, and is done by EVERY. SINGLE. COMPANY. If someone releases a similar product that's better than yours, you don't just hang your head, say "well guys, guess we should've been a little more innovative cry cry cry", then close up shop. You look at what it did better, and attempt integrate their ideas and improve upon them.
Someone somewhere is going to one-up you at something, and they probably did it by taking something you did and implementing it better. Everyone is allowed to be inspired by the competition.
2. Samsung drew out a map on how best to copy the iPhone. This isn't legal. It's flat out plagiarism. No one is allowed to take someone elses ideas and copy them wholesale without any improvements or compelling reasons for copying. You can't take an iPhone and rebrand it as something else.
How people perceive what this document means is very important. Is it an example of 1, or 2? It's the lawyers jobs to try to influence the jury's perspective on the subject.