Danny Boyle explains on the DVD commentary that he shot all the scenes of the Infected in a particular style - using a type of slow motion feature on the Canon XL1 DV cameras with which the film was shot. Boyle explains that the cameras allow filming at up to 1600fps (normal speed is 24/25fps), but that shooting at such a high speed on a DV camera doesn't produce the same effect as it would on a 35mm camera. Shooting at that speed on a film camera gives basic slow motion, but doing so on a DV camera produces the kind of staccato effect seen in scenes involving the Infected. As Boyle explains it, it almost looks as if every third or fourth frame is trimmed insofar as the image has a 'jumpy' quality. Boyle also explains that during the climax of the film, as Jim runs around the mansion, all the scenes involving Cillian Murphy were shot in the same way - thus setting up for the audience a psychological parallel between Jim and the Infected.

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