Continuity mistake: When the topless woman is dancing in the living room the lady to the right is dancing and watching her. It cuts to the Pimp saying his girl is over there and cuts back the girl that was on the right is now on the left of the black woman also topless. She could not have removed her top and made it to the other side that fast. (00:43:39)
Audio problem: At the stock exchange, after Randolph keels over, one guys that they should call an ambulance, whereas Mortimer replies, "Fuck him!" When Mortimer says that, his lips don't match. Not entirely in synch.
Continuity mistake: When there is an overhead shot inside of Winthrop's house when Billy Ray is giving a party, look down on the right hand side - a lady in a black dress is passed out, with her legs draped over a guy's lap. The next scene is a close up, and she's now lying against his chest (head first), then the next scene, she's back lying at the other end of the couch with her legs draped over his lap.
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)
Factual error: The stock exchange shouldn't be open on New Year's Day.
Other mistake: When the $50k check is revealed about Clarence Beeks, both Mortimer and Randolf's positions and their angles appear as if Winthrop is behind them, not in front. (00:15:00 - 00:17:00)
Continuity mistake: The bruise on Louie's left eye changes size and color during the same day, and it is fine the very next day.
Continuity mistake: When Eddie Murphy and Dan Aykroyd's vehicles pull up next to each other in traffic, Eddie's window as seen from the outside is fully open, with a small closed side window. When we cut inside Eddie's limo, the full window is completely closed and there's no side window at all. It's a completely different limo.
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).