In pre-production you must know what your post house can and can't do before you shoot. When planning shots you may want to gather your stock video or plan to shoot your b-roll footage first. knowing what you are going to put in the background and having that organized and/or shot (or at least test shot) before doing the principal can help in working out the composition ahead of time.
Plan every shot and work with the DP and VFX guys to find a balance between their needs. Work with the Art department to ensure all props and wardrobe are friendly to key. Make sure the blocking works with the key and if you have markers that they are present in shots. we need those little x's and funky shapes for match moving and tracking.
Also the proper choices of lenses and even camera can have a huge impact on how a shot keys. Logging camera position, moves, focal length, type of camera, lens, lighting, etc will help alot in post if the match is going to be tricky.
Try to reduce motion blur in the camera if at all possible. The cleaner the image the better.