He's very picky about things such as leaving lights or appliances on in the house. He'll criticize anyone who walks out of the room before doing so. He's generally slow in whatever it is he does, which is why he makes sure everything is done right. If he forgot to do something and was late somewhere, he would still wander back slowely to get it, looking like he's completely lost in thought.
He generally has routines that he follows throughout the day, he keeps his clothes out in the same place, he makes the same breakfast in the morning, etc... He also sleeps late into the morning and generally doesn't like to get up.
He's often quick to criticize, and sometimes it seems like he doesn't know what he is talking about. It may seem obvious to other people, but he just doesn't see it and is convinced he's right. He talks a lot about things such as international affairs, what people are doing in England, Isreal, etc... and he thinks he's an expert on all of these events. He also tries to explain a lot of things through scientific research and what can be explained through physics, etc... He reads a lot of scientific books. He also takes detailed notes on things that he reads and textbooks.
He will often give advice to people and expects them to do things in the same way that he does them. If people see things differently, and like them different, he will think they are stupid.
He enjoys having people over the house and feeding them. Sometimes he doesn't realize when he overdoes it. This can apply to a lot of things. If he's about to buy a newspaper in a town that he is on familiar with, he will end up buying three instead of deciding. Also, when you get him into a social gathering, he may not realize when it's time to stop and go home. He will continue to talk to the same person, but at the same time ignore that person's interest in the subject.