Props and makeup

Make up
The make up will be plain on most of the characters but for those who have more secrets they will wear more make-up (mainly the women). This will represent that they have a lot of secrets and hidden truths that they are covering up.
Props
For props we will have food around the table and general things you would typically find in a dinning room. Where the chairs are placed and how high or grand they are will show superiority, class and importance.
The clock will be of the most importance as the whole movie is based around time, how it's running out and that someone dies at 8 o'clock (the are also 8 people at the dinner party). The clock will be zoomed in on and shot in time lapse to give the idea of time going forwards and the idea of flashbacks and things as such.