[HairOfTheDog]

It is a bit of a goof I noticed too.... Thinking Merry and Pippin wouldn't have been out cavorting farther from home than Sam has ever been either. Oh well!

[doubled]

Merry and Pippin were from other parts of the Shire than Sam, so they did travel more through it, although that doesn't come out in the film. I wouldn't have been curious if Frodo had said it as he also traveled throughout the Shire. It just didn't fit when Sam said it.

[Overtaxed]

Thinking Merry and Pippin wouldn't have been out cavorting farther from home than Sam

Well there are some odd folk down in Buckland and you never know about those Tooks!