I just checked Wikipedia out of curiosity...
Wikipedia (currently) writes: 'Hobbits and derivative Halflings are often depicted with large feet for their size, perhaps to visually emphasize their unusualness. This is especially prominent in the influential illustrations by the Brothers Hildebrandt and the large prosthetic feet used in The Lord of the Rings film Trilogy. Tolkien does not specifically give size as a generic hobbit trait, but does make it the distinctive trait of Proudfoot hobbit family. '''
I suppose that the filmmakers, having already included large feet, would do so now out of continuity in any case -- but again, just curious.
Gollum is interesting: originally he wasn't a Hobbit in my opinion. In the first edition, the narrator notes about Gollum: 'I don't know where he came from or who or what he was.'
And John Rateliff (The History of The Hobbit) adds: '... there's no reason not to think he speaks for the author here and take him at his word. (...) but in either case, all the details of his description argue against his being of Hobbit-kin. Unlike Bilbo, the Hobbit, Gollum is 'dark as darkness', with (...) large webbed feet (p. 158) that flap when he walks (unlike the silent Hobbit, cf. p. 161), and 'long eyes', huge and pale, that not only protrude 'like telescopes' but actually project light.'
But anyway, of course Tolkien made Gollum into a Hobbit, and so whatever description the revised editions included about Gollum had to be dealt with.