The writer of Hackers, Rafael Moreu, went to New York 2600 meetings and talked to various members of MoD (a hacker group which had a book written about them by a local New York reporter, Joshua Quittner, who later worked for Wired and then Time/Pathfinder if anyone remembers that).

The names and handles of the movie reflect this - Cereal Killer, Plague, Joey, Razor - all handles of local New York people. Phreak in a sense too. Some of the kids went to Stuyvesant high school, where scenes were filmed. The kid getting raided in his shower happened locally. The plant worker almost getting shot by a flare gun held by people trashing happened locally. As did other things.

Some other national things made it in, like the Hacker's manifesto written by an LoD member.

Some things were invented for the movie. There was no attractive 19 year old Angelina Jolie type hacking along with the boys as shown in the movie. These guys were not rollerblading through Manhattan together. There was no Cyberdelia nightclub everyone hung out at, although some of the guys might have gone together once in a while to the nightclubs popular at the time (The Tunnel /Limelight / Palladium / Club USA / Webster Hall).