Her bike (the one in the smaller pic to the left) has been confirmed by many to be a dream.
I am specifically looking at the bigger picture on the right and his bike. I'll look at the CB550/650 angle and see if i can find that as well.
One of the things I did notice is that the 550 in some of the pics had flat handlebars, where as bigger bikes seemed to have the U shape bars that this pic shows. I'm not sure if that's just people restoring them with different bars..
Interestingly enough, one of the parts of the movie is that the 'Steve' referenced is a nod to Steve McQueen, and his bike does look (at least from the side shots I remember from the movie) like a mid 60's Triumph which would be a nod to 2 of McQueen's movies.
Edit: Nevermind on the whole triumph thing - I noticed that most of those triumphs had front springs very visibile at the top of the forks, while the pic above does not show those springs at all. The turn signal pattern is also way off for a triumph. Interestingly, when he was working on the side of the bike, I swear it looks more like the Triumph than the Honda.