I noticed a significance for whats behind them.

Adam has a black box....thing that is almost hidden by the ghost.

Maynard obviously has the Empire state building

Justin has something behind him but its really had to tell. All you can see is a sort of white light.

And Dannys (which is the most interesting). The reason i think there is some significance for him, is that the smoke trail(or whatever the hell it is..) goes up and then behind him. Almost making you want to know...wtf