Tony Soprano strikes Ralph Cifaretto after be kills Tracy. In the Italian mafia, raising your hands to another made man is punishable by death. Tony would have been executed for this offense regardless of his rank as boss.
When Ralphie pushes George back into the door using the pool cue in the VIP Lounge, the wall with the door, the door frame, and the wall to the right both shake, indicating that this is a set and not a solid structure.