The problem with this film...(spoilers)
Here's the deal: In this day and age of 24-hour media cycles, reality TV law enforcement procedurals, and social media, films have to be written more clever and realistic than ever. The film does just an ok job of setting up a group of people stuck in an elevator; I can also believe that one of them happens to have a bomb. There are some minor issues getting to this point, but nothing that made me lose interest. However, once it all hits the fan, the film completely drops the ball.
1. Once stuck, and the "technician" called on the intercom proved to be incompetent, why wouldn't the guy whose name is one the building call one his many lackeys and have them start dealing with the issue? The guy seems perfectly content to talk to his wife "I'm sure it won't be long", instead of taking some action.
2. Once they call emergency services, (especially when they know the head of the corporation is on the elevator with a bomb), they wouldn't just say "sit tight" and hang up the phone. They would be in constant contact with these people.
3. When they force the door open and the guy is reaching for the buttons, why are there no emergency personnel services people there (the 49th floor)? As mentioned above, they would be in constant contact with those inside, and by that time, there would be people with the doors propped open talking to them face to face. If nothing else, building security or people from the company I would think would be there.
4. At the end, during the epilogue, it's hilarious how there are news crews just wandering around everywhere. They're filming people getting into the ambulance, walking up to victims...it's hilarious. The media wouldn't be anywhere near these people, and probably the building, until hours after the event occurred. The news crews certainly wouldn't be talking to these people until hours after the FBI debriefed them.
Anyway, for me, these things ruin the film for me. It takes innovation to get around these issues, and this film came up short of that.