When Greg arrives at Pam's Parent's House for the first time, Pam throws his cigarettes on the roof. When he retrieves them while he is stuck on the roof, the packet is the other way up to when it landed there.
Well, actually, there is no slip up there, because if you remember... Pam and Greg arrive to the front door, then Pam throws the cigarettes and they fly over the high point of the roof, landing on the ridge on the other side. In the scene, where Greg chases the cat and finds his cigarettes, they are facing the back yard (and we know that because both Jack and Greg exit through the kitchen/back door). Therefore, Greg finds the cigarette precisely on the side of the roof, where they landed...
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