I was watching Malmkrog when I noticed that several of the speakers displayed a remarkably consistent tendency to append a fricative-like offglide—perhaps [ç], to my ear rather like the German ch after front vowels—whenever a word ends in [y], as in perdu. In attempting to identify this phenomenon, I subsequently came upon the following article.
Z. Fagyal and C. Moisset, ‘Sound change and articulatory release: Where and why are high vowels devoiced in Parisian French?’: Link to article