What kind of tv are you using? If you have a digital tv like an LCD rear projection or DLP, that could be the cause. Those tvs have to process the signal, for example to scale it to its native resolution, and that takes time and can lead to lip-sync issues. Some higher end receivers are starting to include lip-sync delays to compensate for this (slows the audio down to match the video because the video processing delays the video).
While its possible that some DVD players also introduce delays, that is rarely the case. Being an old movie, its entirely possible that in this case it actually is the mixing and mastering of the disc that causes the problem.