It was reported that Rosie nearly clawed her nails off while in the trunk trying to escape as it sunk in the lake. Since 2002, all car trunks have safety release buttons as standard equipment to stop people from being locked in a trunk, whether put there or accidentally locking themselves in.
When Rosie's dead body is discovered her pulse is fluttering in her neck.
When Linden is watching the school video of Rosie and talking to her son Jack she pauses the video on her computer monitor. The camera angle changes and when it cuts back to looking at Jack from Lindens side of the desk the still frame shows Rosie in a different position.