2.not always gin-san
another interisting part of this anime is that the story doesn't revolve around gin-san an yorozuya, you may find someday watching stories aboout kondo-san.
3.expexted the unexpexted
here is another strong point of gintama series. you will never in a hot summer when your fan is broken , and you're trying to find replacement. you have to fight some terrorist that want to get some money making machine.