This problem appears to occur in Voodoo Banshee cards, but it may be present in other cards as well. What happens is the following:
When the trailer is played, the video does not appear to update correctly and it flickers, here is the remedy:
Windows Media Player 5/6:
1) Open the video and right click on the playback window
2) Go to properties
3) Click on the "Advanced" Tab
4) Select "Video Renderer"
5) Click on the Properties Button
6) Click on the "DirectDraw" Tab
7) Under the "DirectDraw options" box, deselect the following:
It should look like this:8) Enjoy the Trailer!