Her show goes out live?
That scene from her show with the abusive guest really made me go "huh?" I'm pretty sure no late night talk show is live. Also her on-show apology for her extra-marital affair sounded way too much like David Letterman's in real life.
Overall though, there were quite a few good laughs in this movie (mainly from Emma Thompson's character) and that's the main thing I require in a comedy, so I can't say it's a bad movie on that count.