I see the housemates found there is a gap in the house door that lets them see the outside.

im sure on eviction night when they open the door it has a kind of flap so as to cover the gap between the 2 doors. hmm. You could easily see light coming through the door though, suprised they didnt notice it earlier.

Pity Tim didn't slip staight through it

he may have if it wasn't for all the gel on his hair that held him back!