Factual error: Following the tavern scene with his father, Bud wakes up early and loads a calendar on his computer: Monday 6 May 1985. Later that day at Jackson Steinem and Co, Marvin says "Buddy, got tickets to the Knicks game tonight. Go out and cruise some chicks afterwards, this is gonna be awesome, whaddya say?" Inviting him to a New York Knicks NBA basketball game. However on that day the Knicks never played, and secondly the playoffs had begun - by finishing second-last in the Eastern Conference, New York were eliminated from making the playoffs. (00:19:40)
Factual error: When Bud gives Carl his dividend check for the money he borrowed, they walk by a DC-9 aircraft. That aircraft has the tail number N901AX. The airline is Bluestar. but AX is the suffix for all Airborne Express planes. (01:01:00)
Factual error: After Bud's conversation with Gordon in the park he goes to a restaurant bathroom. The agents are waiting for him. He open his shirt, they rip the tape recorder off of him then immediately begin to play the conversation. It picks up right where the evidence is. No one had time to rewind the tape. (01:58:45)
Factual error: The opening shot (of the New York Stock Exchange's trading floor) has the subtitle "1985," which might lead one to expect that at least the action in the first few scenes takes place in the year 1985. However, when Charlie Sheen is talking to his Nimrod broker buddy the Nimrod jokes that the day the Challenger exploded, Gekko was on the phone "selling NASA stock short." The Challenger exploded in January, 1986, not 1985. [An explanation for this: Wall Street, as conceived and filmed, was supposed to be set in 1987. However, near the end of 1986, The Ivan Boesky insider-trading scandal hit, many rules were changed, and acknowledging those events would have undone much of the plotting of the movie. So the movie was shifted back in time to 1985 (before the scandals, and also before the Challenger disaster), thus creating this major goof].
Factual error: Bud Fox is sitting in the limo with the hooker talking about Hewlett Packard stocks. Bud says: "HP...now, let's see. It closed at 41 1/4." HP stock price was nowhere near that price until the 90s.
Answer: It's probably just a movie inaccuracy. For whatever reason, probably technical, economical, or for artistic considerations, the scene could have been staged and shot during sunset rather than sunrise. Oftentimes, scenes are not actually filmed when and where they are supposedly set. Locations are often substituted for ones that are more private, more scenic, have easier physical access, are in a less expensive economic region (such as Canada), and so on.
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