I have been watching Kenichi, History's Strongest Disciple, and I think there is a pun in a name there, but as I don't speak Japanese, I am unsure. The only reason I noticed this, is because in Bleach, Ichigo has a zenpaku-to sword, and it means something like soul. And in Kenichi, there is the Shinpaku Alliance, founded by a devil/alien who is Kenichi's worst best friend, who goes to the same school.
There were too many puns to list in the series Urasei Yatsura, but they explained them in the extras part of the disc. Here, this sh0ow still being an unlicensed fansub, there are no extras to find this out. So I am asking you, if you know, and if you have seen other puns.