If the dead person has his mouth open you are not allowed to close it.

Chapter 311 Section 8-9

‘Tiltul min hazad’, moving from the side for the sake of something non muktza, is permitted on Shabbos. A example of this would be a vegetable placed in the ground, if you move the vegetable, the ground which is muktza is moved inadvertently.

‘Tiltul begufo’, moving muktza not with your hands but with other parts of your body, is permitted even if it is for the purpose of the object that is muktza.