Rocket Science (film) - Cast

Cast

• Reece Thompson plays Hal Hefner, a shy fifteen-year-old student at Plainsboro High School, New Jersey with a pronounced stutter. Beginning in late 2004, Rocket Science's producers traveled to several American and Canadian cities looking for an actor to play the lead role of Hal. At one point, Carter Jenkins was set to play Hal, but NBC blocked this as he was contracted for further episodes of Surface. HBO Films told the producers after six months of searching for a Hal that it would abandon the project if a lead actor was not found in two weeks, at which point a desperate Jeffrey Blitz watched all of the unsolicited audition tapes that he had been sent and "knew immediately we had a promising candidate" when he saw Thompson's tape. Although a casting call was originally posted for a teenage boy aged 13–18 who had a stutter and could also act, Thompson had previously been taught how to stutter. However Blitz wanted Hal to stutter in a different style, knowing he was going to block up on a particular word and looking for ways to work round it. Before filming, Thompson was taught this specific style by a speech pathologist.

• Anna Kendrick plays Ginny Ryerson, the ambitious and competitive star of the Plainsboro High School debate team. Anna Kendrick was one of the first cast members to sign on to the film. Blitz recalls writing "Anna Kendrick is Ginny Ryerson" after her audition and, after auditioning many other girls, she was cast. To prepare for her role, Kendrick learned the typical debating strategy of "spreading", a rapid-fire delivery used in order to present as much evidence and information as possible within a time limit. Kendrick and Nicholas D'Agosto studied with a college debate coach and also viewed a live high school debate. Ginny's comment "I upped your game, little man" was inserted into the script by Blitz from a journal which he asked Kendrick to write in character.

• Nicholas D'Agosto plays Ben Wekselbaum, Ginny's former debate partner who dropped out of high school to work at a dry cleaner's after falling silent midspeech and losing the championship trophy. "Nick takes his work very seriously—it's an approach that's very much like Ben, in my mind," said Blitz of D'Agosto, calling his performance "just right". D'Agosto joked about his being cast as a high school student, having been cast as a student previously in Election, which was released eight years before Rocket Science, in 1999. Like Kendrick, D'Agosto had to learn a number of debating techniques to prepare for his role.

• Vincent Piazza plays Earl Hefner, Hal's obsessive-compulsive, kleptomaniacal older brother. Vincent Piazza was studying at the New York acting school where Rocket Science casting sessions were being held; he decided to audition and was one of the first actors to be cast. When he first auditioned, he spoke with a lisp, said Blitz: "I eventually decided to do away with the lisp—one major speech impediment per family is plenty—but kept many of the rest of the choices Vince brought to Earl." Blitz cited Piazza's portrayal of Earl as an example of "the strong choices that actors make in interpreting their character".

• Aaron Yoo plays Heston, Hal and Earl's bi-curious school friend who ends up joining Hal in the debate team. "Aaron made Heston almost an alien among the kids of New Jersey. He's never quite connected to the scene but he's always aware of it," said Blitz about Yoo's performance as Heston. He says Yoo was cast because of the "dramatic decisions" he brought to Heston's portrayal "from the start".

• Josh Kay plays Lewis Garrles, an eleven-year-old boy whom Hal befriends while loitering in the street outside Ginny's house. Blitz was pleased with Kay's original audition: "When Josh Kay came in to audition in New York, it was instantly obvious that he was perfect: smart, deadpan and with a natural ability to either nail the timing of the lines himself or mimic my reading to him."

• Denis O'Hare plays Doyle Hefner, Hal's father who walks out on the family abruptly, following an argument with his wife about suitcases. Denis O'Hare originally auditioned in 2005 for an alternate role, and, describing O'Hare as a "must-have", Blitz had him re-audition at a different session in the role of Doyle. Because of scheduling conflicts, O'Hare was only available for filming on two days of production: the first day and the last, filming one of the first scenes of the film and also the final scene.

• Maury Ginsberg plays Mr. Lewinsky, Hal's vain speech therapist who offers no successful advice. The character was based on Blitz's own experiences as a youth with many well-meaning but mostly ineffective therapists when he sought treatments to his stutter.

• Jonah Hill plays the Junior Philosopher, a teenager Hal meets in the library while studying for the policy debate with Ginny. Hill had initially auditioned for another role in the film, but was unavailable as he was shooting another film at the same time. Blitz was keen to have him appear, though, and so wrote him a small role as the Junior Philosopher, appearing in only two scenes.

• Dan Cashman voices the narrator. Blitz chose to use an third-person narrative narrator to juxtapose Hal, a character with no voice, with a character who is "nothing but a disembodied voice, a purely articulate voice", showing "the gulf between who Hal is and who he wishes to be".

Blitz and the film's producers considered having celebrity cameos in Hal's parents' roles, though he decided that cameos would draw away from the film as the celebrities would not be "onscreen long enough for them to become someone other than the celebrity". In between shooting the film and its release, Hill became a well-known celebrity with the films Knocked Up and Superbad; Blitz describes being "bummed about that" because of his reluctance to feature celebrities.