After Israel published a response to the Goldstone report differing with several of the key allegations, the UN is now claiming evidence of its own casting doubt on the Israeli explanation of a key point of controversy. I'm not making claims as to which side is right or wrong, just reporting the story.
The (specific) controversy is over the destruction of a flour mill, which Goldstone claimed could have been done to deprive the civilian population of sustenance. The report claims the mill was specifically targeted in an airstrike. Israel released photos claiming the damage was more consistent with tank shells, which had opened fire after engaging Hamas militants -- the mill, in other words, was not a pre-planned target. Apparently, though, UN investigators found the remains of airborne bombs at the site, putting the possibility of a pre-planned airstrike on the table (of course, the mill being destroyed by a bomb rather than a tank is entirely consistent with the mill being targeted due to Hamas fighters in the vicinity).