After Jeff saves the cop from falling off the ledge in the final scene, they both look down at the riot that is happening in the street. He starts to try to calm the crowd down and the cop disappears.
When Eric Swann returns after his erroneous on-air silence and after his Marcel Marceau "save", the song he plays (Player's "Baby Come Back") actually begins in the middle instead of at the beginning, as it should.
When Dolores Deluxe exits her corvette, there is a man (perhaps not an extra) who stares at her as she enters the building. He actually briefly stops to watch the entire scene be filmed.
At the end of the film, the staff of Q-SKY along with the owner are celebrating on the ledge in front of the crowd. What happened to the cops that infiltrated the building? They wouldn't have allowed Jeff to make his impassioned speech to the crowd and would have taken the staff into custody for resisting arrest, assault, and violating a court injunction.