For the Halloween scene, everyone should have some sort of costume and makeup. Care should be taken that none of the costumes or makeup should be gory or reflect violence. James should have makeup that runs easily. There should be a means of soaking James and placing water on Eddie's bangs. In the final scene, the policemen and Security Guard Tully should have uniforms, but Tully's uniform should look different from that of the police to help differentiate their roles.
Lights come on suddenly at the sound of a crashing coffee cup to intensify the situation.
I recommend some subtle but uncomfortable lighting manipulation for the same reason. There are more chairs around the table than people. Some people have coffee or soft drinks with them on the table. Other personal paraphernalia may include purses, cigarettes, light sweaters, etc. At least one ashtray is always on the table.