At least in the Ubuntu (14.04.1) package of vlc-nox, I can confirm that the plugin cache file is not matching the installed plugins. The reported mtimes are some seconds below the actial mtimes.
For example for "audio_mixer/libinteger_mixer_plugin.so", the reported mtime is 1400338500 while the installed version of it has an mtime of 1400338604 and thus causes the plugin to be loaded on startup independently of it being needed. This suggests that during the packaging process the plugins are modified after the cache was generated. I would suspect that in Debian the problem is the same too.
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