During the Shoot

Sound Timecode
  Make sure that all production sound is recorded with Non-Drop Frame (NDF) timecode on the DAT or Nagra 1/4" tapes. Without timecode, your audio conforming will take a painfully long time. If you've already shot your film without timecode on your sound rolls, you can still have them transferred to new sound rolls with timecode. This does cost extra money, however. Then, use these new sound rolls for your telecine and your final mix.
Recording Production Sound
  1/4" Nagra tape vs. DAT tape: Most telecine operators will recommend that you use 1/4" Nagra tape for your principle sound tapes, and use DAT for your backup tapes. In general, DAT is harder to work with during telecine. If you request 1/4" Nagra for your principle tapes, most production sound mixers will be glad to oblige.
Picture Slates
  It is a good idea to make sure that each and every take is being visually slated with a unique scene and take number to avoid duplicate slating. Duplicate slating can cause confusion not only for the negative cutter, but for yourself as well. A gentle reminder to the person assigned to the clapper usually assures this.