TV show and film have the same name. Don't know if I need to suffix with "-the-movie" or not.
While I am more or less in favour of iandotkelly's approach, the tag veronica-mars-the-movie is overly complicated and verbose and sounds like an actual title instead of a title with a meta appendage (and in fact when seeing the tag I thought the movie was titled Veronica Mars - The Movie, only to see that it wasn't). Especially when seeing other future movie-TV-overlaps, such policy only leads to cluttering the very (very1) short 25-character tag space with unneccessary information.
I would thus suggest to use the much more concise veronica-mars-movie, especially in consideration of establishing a policy and precedent for future (possibly longer) movie-TV-overlap titles.
I also want to appologize for changing the tag as described above, since I didn't know there already was a meta discussion on it. Feel free to revert my changes if the community decides for a different solution.
1 very very very!
If we ignore for a second that one is a tv show and the other is a movie, the established solution is obvious:
Two works of art with the same title are usually distinguished by adding the year to the newer one. This is common both for movies (total-recall vs. total-recall-2012) as well as tv shows (e.g. the old and new Battlestar Galactica).
I think it would be logical to apply this to clashes between tv shows and movies as well.
To avoid any confusion we could even do