Perfect Stranger - Text Message Silence
This slip up occurs if you fast forward the movie to 1 hour 12 minutes and 49 seconds as Bruce Willis is sitting down and holding on to his cell phone. You can clearly hear the sound of a text message being sent to his phone. On the close up of the phone, you can see the message, and you can also see on the top right of the same phone, you can see a yellow bell with two "Z's" next to it. This icon used by Motorola on the Razor phones to indicate that the phone is in silent mode meaning that you would not be able to hear the phone ring or hear if a text message is sent to you.