The character Karen, Darrel's Boss at work was originally in the script suppose to be a male named Howard. But a couple of days before shooting the scene began the actor playing Howard had to drop out due to being called up for Jury service. So director Anton Arenko changed the characters name and gender. And got instead his mother Andrea to play the role.
Tom Sullivan ended up being cast for the role of Darrel when director Anton Arenko asked him over twitter if he would be interested.
All the locations except the second scene in the office were filmed on one single street.