Mildly accurate. I haven't seen it all, but there were a few key inaccuracies:

* I'm told the film never references Honeysuckle Creek which took the feed during the actual landing, due to bad weather in Parkes. They switched to Parkes, which had a bigger dish, shortly after.
* There was no power-outage during operations as depicted in the film.

Apart from that, it's a great piece of very Australian cinema. That happens to tell a worldwide story ...

Wade.