The falsified data was submitted as part of Apple's filing. It doesn't really matter whether Apple did it or someone in the law firm did it. An injunction was ordered based on the evidence at hand, and visual evidence is always very strong.
This isn't a matter of just making a tweak or two to the scale of the pictures. The Android tablet was also pictured with the app drawer open. Everyone knows that the Apple's main interface is their ugly grid. Comparing the Android app drawer to the Apple main interface make them look identical. On the phone pictures, they loaded the Samsung up with a bunch of icons to make it look like the iPhone. I don't know anyone with an Android that (because its boring and hideous), and I'd be ashamed of Samsung if they advertised their beautiful phone that way. In every way short of putting another iPhone/iPad in the picture and calling it the Samsung product, Apple attempted to falsify evidence such that any reason person would be led to the same conclusion. That's called cheating. It's also called fraud.
To suggest it might have been an accident is silly. You don't accidentally re-size an image to exactly the same size as another image that you're trying to prove are similar. It may not have been someone with an Apple name-tag that did it, but you can't hire someone to represent you and then say they aren't representing you. You can fire them and ask the judge to reconsider the new, honest information, and anyone who was being honest would lose no time doing that. At this time, I haven't heard of that having been done.