Yes, I just recently shot that movie, and it looks like the mall(s) that they shot it had simplex systems. I saw verticle and horizontal-strobbed speaker/strobes as well as Life Alarm speakers on those strobe or light plate things. There were also simplex single-action t-bars behind Stopper 2s. Also, it appears that they make announcements over the fire alarms. This happens twice in the movie; on time towards the beginning, and one time towards that late-end.