Alan plays an instrument ( the drums) , but the flatmates don't. That's why he isn't selected.
Sarah has a pet ( a dog ), but the flatmates don't. That's why she is rejected.
Philip can't afford the rent ( £ 150 a week ), but the flatmates can. That's why he isn't selected.
Anne smokes, but the flatmates don't. That's why she isn't selected.
Jane is selected because :
she likes good food, so do the flatmates.
she doesn't smoke, neither do they.
she doesn't play an instrument, neither do they.
she doesn't have any pet, neither do they.