The mop fair shown in the film only comes to town once a year for three days, the director planned it so that 'The Infected' was filmed whilst the fair was in town.
During the beginning of the film when the mop fair is shown to be abandoned, it was actually filmed at 9 o'clock in the morning, hours before it opened giving the sense of isolation.
The Evesham Observer newspaper that David finds was created by the director a few hours before filming began.
The scene where Tom and David are down the alley talking to the camera was the first scene filmed.