Not a moped but a small motorcycle, possibly a Ducati 125 from the mid-1960s. It might even be a Spanish built model. Ducati, il semble... Look's like a 1970 DUCATI Since the movie was made in Spain, it is probably a Mototrans Ducati 125. For sure it has the typical Ducati Desmo engine.
Ducati 125 Sport ???? Link to "guywebster.com"