By "modern IE languages" you have most probably intended English or some other of the most widespread European IE languages. But if you reckon all the modern IE languages, you can't even imagine the variety of sound they can have. Modern Dutch has many quite unique and "strange" vowels, Modern Indic languages have some weird "breathy" vowels and retroflex consonants; modern Scandinavian languages have tone-like accents; Modern Russian and other Slavic languages have rare fricatives and central vowels; and so on. Therefore, in comparison to the whole variety of the modern IE sound systems, nothing would be exotic enough.
Another difficulty is represented by the fact that we don't have a complete certainty about the pronunciation of the IE reconstructed phonemes. Indeed, there are at least two different phonetic interpretations thereof: the classical interpretation postulated by the Neogrammarians and that of the Glottalic theory. If we accept the latter, most consonants will sound quite odd to an English speaker. Another famous case is that of the laryngeals: we don't have the slightest idea of how they could have been pronounced, so that we just transcribe them with numbers: H₁ "laryngeal 1", H₂ "laryngeal 2" and H₃ "laryngeal 3". Many theories have been suggested in such respect but the issue is still under debate.
The authors of the movie you quote must have simply asked a specialist in Indo-European studies to give them an idea of a possible pronunciation, and then the actor has performed - with a strong English accent - something that, for the average audience, sounded like gibberish meaningless formulae. And when someone who has no special training in field fonetics hears an unknown language, he/she cannot be even sure about what sounds have been pronounced. Thus, some "normal" sounds can appear exotic because of some additional features (like tones or special accents), as well as something really exotic can easily escape the attention of an untrained listener.