Plot hole: As the guys are checking out the vacant house inside, they are surprised to see it has a pool. However the problem with this is its right next to the driveway in the front of the house, in the open with no fence in front of the driveway so it would provide a clear look through from the alley. As they state they never noticed it in 18 years living there, yet walking up and down the alley it's a bit hard to imagine being that open and they never saw it. Even the final shot (aerial shot) at the end of the episode we see it was far too obvious for them to have never seen in that space of time.
Continuity mistake: When Luanne gets home from work at the start of the episode, Bobby is waiting for her to get the food she brings home. She puts the duck shaped bag on his tray with the beak of it facing Bobby. The next shot its facing the other way.
Answer: Because Kahn doesn't like Hank and Buckley annoyed Hank so much.
Captain Defenestrator