When Paolo, Andrea and Bianca go up to their apartments near the beginning of the film (6-8 minutes in), they light their way with matches, and Paolo lights a lamp in his apartment with a match, but when he returns to his apartment later that night, after leaving Bianca with the professor (about 36-37 minutes in) he simply flips a light switch when entering his darkened apartment to turn on the lights, then blows *out* the lamp he had lit previously.