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This is actually somewhat common. One thing that can cause it is any form of "seamless branching" or "alternate versions" of a title.
A few quick examples...
1. A film has a director's cut, and also a theatrical cut, both on the same DVD. Since MOST of the movie is the same identical thing, the authors decide to simply have your choice "branch out" to the additional scenes, at the appropriate time.
2. Star Wars III... the opening "crawl" where the familiar text scrolls up on the screen needs to be available in three or four different languages. AFTER this text has ended, the rest of the film will be identical visually, no matter which audio track you chose to watch it in (English? Spanish? French?) So, Title one has the English crawl, and then it just uses the same video as the others. Title 2 has the French crawl, and after that it just uses the same video as the others. And so on.
3. A lot of DVDs have used this for commentaries (even though they do not usually need to, and it is probably not technically the proper use for this sort of structure.) In such cases, Title 1 might have the usual audio tracks (5.1, 2.0, Spanish, French) available for selection, but Title 2 might be the only one which has a director's commentary attached to it, and this commentary track might be the only audio track available for Title 2.
4. I have also seen a few where there were silly "icons" that appeared on the screen, superimposed. These icons indicated that there were additional extras, or information, or trivial matter available about a particular scene. One was supposed to use the remote to select the icon, to access this additional material. In such cases, Title 2 might have the icons, and the programming that controlled the timing of when they were supposed to appear. Title 1 has no such icons, and was just for those who wanted to watch the movie normally.
There are other examples where this same "branching" is used.
Often, you can determine the differences yourself by just previewing a bit of the film. Sometimes, you will see a difference in the listed times, which will give clues. (If the time on two or more titles is identical, expect something like example 2 above.... if the times are different, expect something closer to example 1 above).
I have now come across as many as five different "Titles" when this sort of seamless branching was in use.
To learn more, do a search on "angles" or "seamless branching" or "multiple titles." You will find a lot of threads that have discussed this in the past.
-Bruce in Chi-Town
This message has been edited since posting. Last time this message was edited on 26. November 2005 @ 19:18
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