I bought the DVD about a year ago and have watched it hundreds of times. Its an amazing film and the detail is flawless.
We must remember that although the film is accurate in the general sense, much of the conversations being said by different persons, tone, inflection, intent, emotion, etc can only be surmised. The only person who apparently was ever thoroughly interrogated about the meeting was Eichmann while a prisoner of the Israelis so its pretty safe to assume that his version of events may be tainted. The other attendees, if questioned at all, denied knowledge or claimed to not remember what occurred. And it may be possible that some may not really remember because meetings such as this took place quite often in the Third Reich and the Wannsee Conference, at the time at least, was not a standout meeting in most respects. It mainly was a meeting called by Heydrich to assert his dominance and control of the "Jewish Question" and not a lot else. The holocaust had pretty much already started, all it needed was some of the other bureaucracies to get with the program as petty rivalries were rampant in the Third Reich.