Factual error: When the guys arrive in Switzerland and pull up at the office for their meeting with the Swiss Banker, the car is driving/pulling up on the left-hand side of the road, whereas the Swiss drive on the right. It's probably because the scene was filmed in the City of London (UK drives on the left), as there are City of London street signs visible in the background. (01:42:06)
Factual error: When Jordan tries to escape with his daughter in the Mercedes, he pulls the parking brake with his hand (a hand-type parking brake) to stop the car, but that car (Mercedes Benz SL Class R129) is only available with a foot-type parking brake, making his action impossible. (02:43:35)
Factual error: The screen writer has inadvertently turned Jordan Belfast into an omniscient being through his incredible foresight to have known in the mid-90s that internet stocks (late 1990s) and CLOs (mid 2000s) would become the subject of significant Wall Street misdeeds...with that type of foresight, Mr. Belfast would have never had to pump and dump stocks to make money! From the yacht scene at World Financial Center: "You know who you should be looking at? Goldman, Lehman Brothers, Merrill. What those guys're up to with collateralized debt obligations? This internet stock bullshit? C'mon. If you want, I'll walk you through exactly." Sloppy unprofessional writing - completely out of context for the time at which the discussion was happening...it sure would have been interesting if Agent Denham had taken Jordan up on the offer.
Chosen answer: As seen from Donne's reaction when the FBI storm the building shortly after, It should be assumed that Donnie told the FBI himself, and kept the note as evidence. One of the reasons for this could be that Donnie must have felt betrayed or something similar.
Dra9onBorn117