Visible crew/equipment: In one shot where the camera is following alongside Robert with his hand stuck in the window, who is now running alongside the driving car, you can see, in the reflection of the collectors car windows, the top of the black car which is driving alongside, filming the shot. (00:29:50)
Continuity mistake: When we see Derek land on the rock after taking the fall down the cliff, behind the rock he landed on there is grassy hills and then some big rocks. Later when they say birds were the only thing he can relate to, it shows a shot of Derek covered in gulls, but now the huge rocks in the background scenery have gone, and in addition, the position of his legs have changed too. (00:23:25 - 00:25:55)
Revealing mistake: Derek skids to a stop (on a road which is covered in gravel) - you can see a set of white tire tracks (kind of white skidmarks in the gravel, if you know what I mean) in the exact same place where he screeches to a stop. Multiple takes anyone? (00:59:15)
Revealing mistake: When Derek awakes on the rock, he obviously headbashes a gull made of wood. It is very fake, may be deliberate (This could be a "deliberate revealing."), but is a mistake nonetheless.