Other mistake: In this movie, Gandalf looks older than he does in his grey incarnation in Lord Of The Rings: The Fellowship Of The Ring. However, this takes place before the Lord Of The Rings trilogy, so he should look younger, or the same.
Other mistake: When giving Sting to Bilbo, Gandalf tells him it is an Elven blade and will therefore glow blue when Orcs are near. However, Glamdring and Orcrist are also stated to be Elven blades, but they do not glow blue.
Other mistake: Just after he arrives at the gathering Thorin states that he wouldn't have found Bag End had it not been for the mark Gandalf made on the door. Bilbo then claims that 'There is no mark on that door, it was painted a week ago'. However in the earlier scene where Gandalf makes the mark the paint work is cracked and weathered, more than it would have done after only a week.
Other mistake: When an invisible Bilbo is about to jump over Gollum to exit the cave, you can see Gollum prepare himself for impact just before Bilbo jumps over him. This isn't logical if Bilbo is invisible.
Answer: In the film, Gandalf tells the dwarves he chose Bilbo because hobbits are light on their feet, and because Smaug would not recognise the scent of a hobbit as he would a dwarf. Also Bilbo is the most adventurous of the hobbits in the Shire. This reason is not in the book but is from the story "The Quest of Erebor" in Tolkien's Unfinished Tales.
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