Question: Why does Norton lie and say that he "has company" and then make De Niro wait longer during the robbery? Sure, Norton double crosses him later, but wouldn't making his partner wait put both of them in danger of getting caught since it delays them and increases their chances of getting caught?
Question: How did Robert know Edward was gonna double cross him?
Answer: He didn't know for a fact that it would happen, but he was experienced enough in these kind of high-stakes operations to plan for literally every contingency, including a double-cross.
Question: What baseball hat was Jack wearing at the ending? (04:44:00)
Answer: It appears to be a Baltimore Orioles hat with the '89-'97 logo. Edward Norton was raised in Maryland, just outside of Baltimore.
Question: During the sequence in the vault, De Niro uses a kind of torch. This torch emits sparks and is powerful enough to cut steel but is small enough to take with him. Is there such a torch? And if so what does it use for heat?
Answer: It's called a thermic lance.
Answer: More than likely its a plasma cutter. I am not sure what it uses for heat but I know its a common welding tool used in motorcycle and car shops. You can see one being used on Monster Garage on Discovery all the time.
No... That's a Thermite or Thermic lance. It melts steel nice and clean.
Answer: Norton already has an advance plan to prevent himself from getting caught. The delay is both to fluster DeNiro, and to prevent him from having enough time at the moment of the double-cross to come up with an alternate to handing over the prize without getting caught himself.
Rooster of Doom