Visible crew/equipment: After Mortimer's comment that Billy Ray has probably been stealing since he could crawl, when it cuts to the two officers opening the squad doors to place Billy Ray at the back of the vehicle, the barndoor set lighting is visible over the squad car at the top right corner of the screen. (00:18:25)
Visible crew/equipment: When Winthorpe enters the Duke and Duke building he removes his coat and scarf, then as he walks toward his office the actor's two black tape marks (one where he stood, and one where the first woman said good morning) are visible on the floor behind him. (00:05:30)
Visible crew/equipment: As Murphy and Aykroyd are leaving the bathroom to head to the trading floor, you can see the shadow of the dolly track on the lower right hand side of the frame. For a brief second you can also see the actual dolly track before they enter onto the trading floor. (01:42:40)
Answer: Without knowing precisely how many stocks Winthorp and Valentine sold at the beginning, there is no way to get an exact figure. But we can make some educated guesses. Frozen Concentrated Orange Juice is sold in contracts, with each contract containing 15,000 pounds. By the end of the day, Winthorp and Valentine were making at least an 84 cent profit on each pound, and $12,600 on each contract. If they sold 20,000 contracts, their profit would be $252 million. Considering the Duke's lost $394 million, that estimate seems to fit (and is likely even a little low).