The film #Syriana in its original version has a high number of #L3AVT utterances in Arabic, Persian etc with English subtitles. But some are unsubtitled. Are English-speaking viewers disturbed by the omission? Or do they trust the film-makers that they are not plot-pertinent?

If so, could non-English viewers trust interlingual subtitlers in the same way? Meaning that if an utterance is omitted in the translated #subtitles, it either means what you think it does (a name called, a salutation) or it's not relevant, the conversation can be followed anyway