Frodo's change from book to film

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Browsed FotR the other week and some of the major differences between Book-Frodo (BF) and Movie-Frodo (MF) I noticed were:

Age-difference: It's obvious that MF is much younger than BF and not only in appearance. While BF is a mature, intelligent and self-assured Hobbit who is able to handle himself well in just about any social situation (and he does pretty well in a crisis too), MF is more of a whelp and out of his depth most of the time.

Character: What I find curious though, in the light of what I just wrote, is that MF (as I remember him) seems more serious than BF. At least in the beginning of the book we get to know BF as a pretty funny guy. He exchanges jokes with M&P and has a tendency to have a few drinks too many. BF was just an angsty guy, wasn't he?

Class distinction: BF and his chums Merry and Pippin are very bourgeois. Although BF treats Sam with the greatest of respect, he is still, at least initially, his gardener and servant rather than his friend.