Quinn isn't even speaking Italian during the shooting:
As was the common practice for Italian films at the time, shooting was done without sound; dialogue was added later along with music and sound effects. As a consequence, cast members generally spoke in their native language during filming: Quinn and Basehart in English, Masina and the others in Italian.
That's not the case for the films I'm describing. Here's the start of La Strada:
https://www.youtube.com/watch?v=7jSewbxyHYM
Quinn isn't even speaking Italian during the shooting:
As was the common practice for Italian films at the time, shooting was done without sound; dialogue was added later along with music and sound effects. As a consequence, cast members generally spoke in their native language during filming: Quinn and Basehart in English, Masina and the others in Italian.
https://en.wikipedia.org/wiki/La_Strada#Sound
It's even more clear in this scene:
https://www.youtube.com/watch?v=f7fmvA_KG6U