Servants' reactions
I notice that a couple of the servants had curious reactions to Maurice and Clive's relationship. For example, from the beginning, Simcox (the head servant) seemed sternly suspicious, and even vocalized some of these suspicions. First, he questioned Clive about whether he knew the Viscount in school, and later on alluded to the dirt on the floor in Maurice's room after his tryst with Alec. In both cases, Simcox makes his statements with a knowing and accusatory air. I got the impression, from Simcox's facial expressions, etc., that his seeming disgust with Maurice and Clive stems from the fact that he is gay himself, and tries to cover it, perhaps even from himself, by moralizing.
Also, the girl servant who shows them to their room upon their arrival shows visible distress at a couple different points in the movie. I would guess that she is onto them, but does not know how to handle it and so feels burdened.
I'd be interested in hearing other thoughts on this.