Factual error: In the scene where the FBI agents have taken Giovanni Ribisi in for interrogation, one of the FBI agents says at one point "...and I want the whole C:/ Drive backed up on a floppy.", which is pretty hard to do, if not impossible, unless you've got about a 5Mb hard disk drive (depending on compression levels). But later on in the scene where Ribisi is actually doing it, he does it in about 10 seconds...with a 1.44MB floppy.

Other: In the scenes after Giovanni Ribisi is arrested, his looks are constantly changing. In scenes where he is talking to Vin Disel his face is very fat. When he walks by Abby's desk he is thin again. If you get Boiler Room on DVD you'll see an original ending where Ribisi is thin all the way through the end of the movie; Because Giovanni was preparing for a film that required him to gain 30 something pounds, the scenes that needed to be reshot for a different ending are very defined.

Other: At the end of the movie after Seth talks to Chris in the stairwell, Seth goes down a flight of stairs and passes Abby at her desk. However, in the beginning of the movie it is clear that her desk is right outside of the trading room, on the same floor. So how could he go down a flight and still be on the same floor?

Continuity: Near the beginning, Giovanni Ribisi has a voiceover in which he refers to the #6 (subway) going to Fulton Street. The #6 train does not stop at Fulton, the 4 and 5 do.

Continuity: When Seth's father calls him asking if he can help out with Seth's stock deal, listen carefully to everything said. When the FBI agent plays it back, right before Seth's father leaves the FBI office, saying "You can't charge me with anything," the agent plays back the recording of him and Seth talking, and the placement of what they are saying is totally different from the actual conversation.

Audio problem: When they go to celebrate Seth passing the Series 7, Richie asks who ordered the beer and another character asks what's up. Richie says, "What's up, I hate it" but his lips are saying something else.

Continuity: At the beginning of the move when it shows Seth on the bus there is no one sitting in the seat in front of him. The scene cuts to inside the bus then pans forward to show two occupants in the seat in front of him snorting cocaine out of a briefcase.

Other: In the scene where all the guys are in a bar and Greg is about to leave with Seth, a big guy bumps into Greg. When Richie is beating this big guy up outside the bar in the alleyway, you can see that the guy is fully conscious but is letting his arms just lay on the ground without even trying to protect himself. Really bad acting/directing.