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The spell web indicates:
Anyone in the effect's area when the spell is cast must make a Reflex save. If this save succeeds, the creature is inside the web but is otherwise unaffected.
Then later in the description states:
The entire area of the web is considered difficult terrain. Anyone moving through the webs must make a combat maneuver check or Escape Artist check as part of their move action, with a DC equal to the spell's DC. Creatures that fail lose their movement and become grappled in the first square of webbing that they enter.
Wouldn't a creature that made its save when the spell was cast be completely unaffected by web, including the difficult terrain feature?
SAVE: reflex negates;see text:
...
Anyone in the effect's area when the spell is cast must make a Reflex save. If this save succeeds, the creature is inside the web but is otherwise unaffected. If the save fails, the creature gains the grappled condition, but can break free by making a combat maneuver check or Escape Artist check as a standard action against the DC of this spell. The entire area of the web is considered difficult terrain. Anyone moving through the webs must make a combat maneuver check or Escape Artist check as part of their move action, with a DC equal to the spell's DC. Creatures that fail lose their movement and become grappled in the first square of webbing that they enter.
You are unaffected by the element that you can save against, Which is just whether you start out grappled - you only get a save when the web is initially cast. I don't believe that the difficult terrain and requirement to CM/escape artist check to not become grappled thereafter are a part of the effect that you save against.
If it was a flat out reflex negates everything you wouldn't need to read the text.