When we first see Mr. Collier at the party, he is wearing a bow tie that you don't have to tie. (You can see the clip used to tighten or loosen the tie.) Later, in the billiards room, he is wearing an untied bow tie that you do have to tie.
In this episode, Frasier says that he loves tassels. However, in the Frasier (1993) episode My Coffee with Niles (1994), Frasier tells his brother Niles that he does not like them.
Rebecca drops the lighter in Woody's drink. If this were an expensive Cognac, containing 40% alcohol, there would have been a flame of sorts when he went to light the cigar.