Gray's identity issues -- presumably the movie's main focus -- share time with too many subsidiary scenes that seem (rightly or wrongly) to have been written for as many actor-friends of the filmmakers as possible.
[Heather Graham] needs something to counteract her wholesomeness. In Gray Matters -- her name is Gray, get it? -- what you see is what you get. The fact that her character 'discovers' she is gay is as unbelievable as it is contrived.