It's made clear that Danny Morgan and Trudy are unmarried. Yet when Sandy interviews her on the disappearance she's listed as being Trudi Morgan. She would only have Danny's last name if they had gotten married.
When Danny leaves the house the morning after spending his first intimate night with Glenda, he has no shoes on. Yet in the subsequent shots (as he meets with a gaggle of reporters), Danny clearly has black shoes on.
When Danny first falls out of the tree in Glenda's yard he has a large cut on his shoulder, which Glenda helps him clean. It's still there the next morning when he swims in the river, but by the next time we catch a glimpse of his shoulder, just a few days later, it's gone.
In the beginning, Danny tells his friend he is flying to Port Douglas to go camping. Port Douglas does not have a civil airport. To get to there from Sydney one would have to fly to Cairns and then catch a bus farther north to Port Douglas