Bruno used to slide down the banister in his house in Berlin.
Pavel heps Bruno when he falls off the swing.
When Bruno was talking to gretel about their lives in Out-with, Gretel told Bruno that she want to go back to Berlin with her friends, but Bruno told Gretel that he has fun because he has an imaginary friend. Bruno invented the imaginary friend because he wants to protect Shmuel.
It only rains once, while in the book it rains several times.
While in the book Maria and Bruno talk about Pavel, in the film they don`t,
Gretel was more friendly to Bruno. He doesn´t talk about Shmuel, instead her sister tells him what is the concentration camp.