Plot hole: In this episode, Hank meets his paternal half brother. They look alike. However, we saw in an earlier episode that Hank's facial structure takes after his mother, not his father. Since they are paternal half brothers, then the Japanese brother cannot look like Hank since he has a different mother.
Factual error: As the Hills get off the plane in Japan the camera crew is waiting for them as they exit the terminal however they do not go through any sort of customs area. Every international flight you must go through customs before entering the country.
Continuity mistake: On the plane whilst Bobby is watching the TV in front of him, you can see a man to the left of Bobby and an empty seat to Bobby's right. The seat arrangement looks to be like the middle row of seats where there is 3 seats instead of two. After the shot shows footage for the "Haiku" movie the shot changes to Bobby and the man sitting next to him but there is now no empty seat next to Bobby. It appears that he is now sitting at a window seat.
Factual error: During the scenes where the Hills arrive at the airport in Japan, there is no flight crew outside or around the terminal when they exit. Whilst they may be the last people to exit the plane, there will be one or more crew members to farewell passengers and also to close the terminal door. There doesn't seem to be any crew anywhere close, which seems particularly odd especially as Hank and Cotton manage to just stroll back onto the plane. A little after they leave the camera crew just go right through the terminal onto the plane without anyone there to stop them.
Factual error: In the airport scene in Japan, the news crew arrives to film Cotton Hill. As Cotton Hill gets back on the plane trying to escape the news crew, we see a shot from outside the plane and the news crew is out on the tarmac. With security regulations at airports a film crew wouldn't be allowed to just go out onto the tarmac.