 The show is shot as a documentary, so characters swearing is  bleeped out. However, the producers must find ways to obscure the  mouths of the characters who are swearing so that their mouths dont  have to be blurred out. This is often accomplished by cutting to a  shot of another character reacting to the swearing, or by blocking  the mouths with objects. Sometimes the characters resort to just  covering their mouths with their hands.