A couple thoughts.
If you don't have the "Redux" version of the screener, I recommend you try reducing the color saturation by about half. The versions floating around are way overblown.
Also, as far as isolating dialog from the trailer, assuming the trailer is stereo (mono there is no help for), you can try doing an upmix to 5.1 with a dolby prologic decoder (my guide is somewhere on this site). The output should have the dialog in the center channel.