Other mistake: When Blake makes the tape of Styles and the prostitute, and uses it to discredit him, I doubt that Blake and his buddy had access to top notch equipment. Surely, experienced Los Angeles detectives would have a great technician on board who would be able to testify that the tape was fixed or modified, such as Styles's mouth movement.
Other mistake: After Ferris supposedly hangs himself, Nick and Larry are there. In the overhead shot where we can see the noose on the fan, the stretcher wobbles yet nobody is touching it.