Yep it has been discussed many times. It is one of the worst mistakes in the movie, and sadly it is made where great attention to detail is paid, namely the baseball game to which Carlo is listening and the fight poster on the wall behind the scene where Sonny is beating Carlo to a pulp.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
"I stood in the courtroom like a fool."
"I am Constanza: Lord of the idiots."
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