When Jack goes into the office to use the phone, he picks it up and drops it on the desk when he sees that it doesn't work, leaving it in a jumble. Later, he reenters the office and the phone is back where it was. This is because those scenes were shot out of order.
When Jack comes through the door back into the main poker room, the door behind him is open. During his next conversation, the door is closed. At the end of the conversation, the door is open again.