I don't know who this Rex...thing...is, but why was it necessary?? What did it add? It's creepy, it can't act and whoever wrote its lines should equally be fired. I was hoping it would just be a passing character when it first appeared on screen (for WAY TOO LONG, I'll add) but no...it appears to have remained in the film. I don't know for sure as I eventually quit watching because of it. That thing should never work in entertainment ever again. Sucks because other than that I really liked the cast--especially Rachel Dratch. How did no one see that this 'Rex' character was ruining the film whilst they were filming it?? The casting director should also never work in Hollywood ever again.
