The flat-screen television that retracts into the floor was thought up by Cameron Crowe and Tom Cruise while brainstorming things they've always dreamed of having, that the David Aames character should have. Crowe says in the commentary that the design was drawn up by Cruise, who wanted to install one in his house before realizing that it would retract through the ceiling of the floor below him.
When David goes to see Sofia for the first time after the accident, her ponytail is hanging in front of her shoulder. In the very next shot, it's hanging down her back.
When Sofia is looking at the drawing that David made for her, we see her right hand move across the picture as she starts speaking. In the following shot her right hand is holding the picture.
At the end of the movie when David is standing in the entrance hall of the LR building you can see the camera team reflecting in the windows on his left.
This is for the audience which had difficulty understanding the plot, and what really happened in the film. Click this link:http://www.imdb.com/title/tt0259711/board/thread/210591908?d=210885364&p=1#210885364