Plot hole: It makes no sense that Martin would be getting the invitation to the reunion mailed to his office (or to anywhere else.) He's had zero contact with the alumni committee, and they're not going to hire a private detective to find him. He also doesn't have contact with anyone else from his hometown who might have forwarded it; his father's dead, and his mother's not in her right mind. There's no explanation for why it would have ended up there except for needing to set the plot in motion.

Grosse Pointe Blank (1997)
1 plot hole
Directed by: George Armitage
Starring: John Cusack, Dan Aykroyd, Joan Cusack, Minnie Driver
Continuity mistake: In the scene where Blank goes into the DJ booth to talk to his high school girlfriend, every time the camera goes back and forth to her, her necklace is twisted and then untwisted.
Marcella: You know, when you started getting invited to your ten year high school reunion, time is catching up.
Martin Q. Blank: Are you talking about a sense of my own mortality or a fear of death?
Marcella: Well, I never really thought about it quite like that.
Martin Q. Blank: Did you go to yours?
Marcella: Yes, I did. It was just as if everyone had swelled.
Trivia: The "goon" who winds up fighting John Cusack in the school hallway is Benny "The Jet" Urquidez. He is not only a world-class kickboxer but has also been John Cusack's real-life kickboxing coach for many years.
Question: Does anyone know what kind of pistols Martin Blank uses in this film? Also, is the gunfire sound they make accurate? It's very distinctive.
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Chosen answer: His pistols are 9mm Glock 17's (http://www.glock.com/g17.jpg). No movie firearm shot is authentic as it would sound very flat and unexciting because the blank rounds used are very quiet (not much louder than clapping your hands actually). The shot sounds are added in post production.
Grumpy Scot