Something that really bothered me...

I watched it in a laptop, seems have same experience with TS.
Guess we need bigger screen :)

One conclusion I drew from the movie was this: all the paranormal activity might have been missed if not for a neighbor breaking into the house, searching for incriminating evidence. The grieving family misreads the knowing intruder's noises as being supernatural. The son sets up cameras and exploits the opportunity to fake a few ghostly visions of his sister; he does this to inspire his father to exhume her dead body and put his mother's mind at rest. All the surveillance gives the family an opportunity to spot a real specter.

I imagine that the neighbor's urgency had him looking day and night for the tape. His familiarity with the Palmers and their home probably incentivized him to risk searching while they were asleep. I get the feeling that this neighborhood in Australia is also a little more open and familiar, and that breaking into people's homes isn't terribly difficult (June did it in a daze).

This is not a typical story about a typical family. I suspect that the son is mildly autistic, but that the "documentary" respects his privacy on this matter. Alice's sexual experimentation is not dwelt upon -- we are given brief glimpses into her private life but, again, the "documentarians" respect the family's privacy -- the Palmers are given room to present their daughter primarily as they knew her. The mother, June, is a nervous person who might have a latent disorder that emerged in grief, causing her to invade her neighbors' homes. The father keeps his emotions from his family and colleague. This gives us an environment where people do obsessive things that, in this case, yield unusual results.

We might have ghosts around us, but most of us aren't driven to videotape several rooms 24/7, and then scour the tapes for clues. LAKE MUNGO provides a compelling environment in which I can believe that the supernatural is captured on film.

it was eerily silent in the background music department.

Either there are two versions of this film or your hearing is shot. The soundtrack was impressively creepy, I could barely stand to listen to it. It was a fine line between being intrusive and driving the images into surreal disorder. I think, paradoxically, it works, but at the cost of me wishing it would stop. Regardless, the score is there most of the time. As for buying it...people bought the soundtrack of 2001: A Space Odyssey, a large portion of which is György Ligeti's surreal score. I mention this because to my ear this is an obvious musical influence.