One of the funniest lines from the book that made it into the movie:
Peter: Girls can't carry a map in their heads.
Lucy: That's because our heads actually have something in them.
In the book, the transition from Earth to Narnia is a highly uncomfortable "pulling" sensation as the Horn yanks them into Narnia. Once they find out that the Horn was responsible, Edmund compares it to summoning a genie and says, "Now we know what it feels like for the Djinn! It's a bit uncomfortable to know that wecan be whistled for like that."
The first episode opens with the Pevensies at the station - sprinting to find a free bench to sit on. The force of it knocks another girl completely off the bench. Susan then taunts Lucy for her unladylike behaviour.
Susan: Lucy, really. Who would ever believe that you were once a Queen of Narnia?
Lucy: You jolly well ran too, Queen Susan.
The Pevensies rescue Trumpkin from a group of Telmarines. Susan shouts "drop him" and one of the Telmarine soldiers quite literally drops into the water, and Susan swims and rescues him.
Trumpkin: Drop him?!
Susan: A simple thank you would suffice.
The quickest way the Pevensies know to get to Aslan's How (formerly the Stone Table) is to cross a river called the Rush. When they finally find it, after 1,000 years in Narnia Time, the peaceful little river that used to be no trouble to ford is now at the bottom of a deep gorge.
Susan: See, over time, water erodes the Earth's soil, carving deep into the...
Peter: Oh, shut up.
It takes them a while to figure out where they're going: