Chapter 14: Bruno Tells a Perfectly Reasonable Lie

(150-1) What information do we get that makes the reader start to feel that he is becoming less innocent and more ignorant?
He sneaks out of home and sees Shmuel and when he sees something wrong with Shmuel he assumes he's ok and doesn't ask.
(151-3) What is interesting about the weather and how does it relate to the overall emotion of this stage in the book?
The weather is a rainy and it relates to the overall emotion of this stage of the book because its sad and weary because Pavel has died and Shmuel is injured and its just not a happy time. 
(153) What does Bruno accidentally say to Gretel?
Bruno accidently says that Bruno has a friend, but he covers it up by saying his friend is imaginary.
(154-5) Is Bruno able to consider Gretel's feelings? How do you know?
I not too sure but i think yes he is because hes trying to make her think hes embarrassed and can make her think he is.
(155) What is it that motivates Bruno not to tell Gretel the truth? How does this portray Bruno as being selfish?
What motivates him is the fact that he doesn't want to share Shmuel as a friend and wants Shmuel to himself. This portrays Bruno as being selfish because that is an act of selfishness and it shows he doesn't want his sister to be happy.
(158) What is it that Bruno realises when he starts recounting what Shmuel tells him? Why do you think that this is when he finally starts to realise what Shmuel is experiencing?
Bruno realises that it's sad and must be really hard for Shmuel to tell him. I think that this is when he finally realises what Shmuel is experiencing because its different when you say it yourself and think about it and process it more, Bruno is picturing it more and taking it in more than if he was just hearing it from Shmuel. 
(159) What is ironic and hypocritical about what Gretel tells Bruno regarding imaginary friends?
Whats ironic and hypocritical about Gretel telling Bruno about imaginary friends is that she talks to her dolls which can't talk at all and she pretends that they're talking back to her. Its the same concept.