Hmmm...never noticed this one until now.
As Turnbull noted, there are several well-known (and many not-so-well-known) continuity errors in the GF films. On the Internet Movie Database's Godfather page, you can check out a whole bunch of these by clicking on "goofs". In fact, if one was so inclined (and had a publisher lined up!), one could literally write a book about all the little goofs and errors in the Trilogy.
And yet, they do not diminish the films in terms of their quality and their ability to hold our attention even after repeated viewings.
Signor V.
"For me, there's only my wife..."
"Sure I cook with wine - sometimes I even add it to the food!"
"When life itself seems lunatic, who knows where madness lies?"
"It was a grass harp... And we listened."
"Do any human beings ever realize life while they live it? Every, every minute?"
"No. Saints and poets, maybe... they do some."
| 
