Do the details of these hands with Hebrew letters have any real-life meaning?
I'm a native Hebrew speaker, and it doesn't really have any meaning. There's also Hebrew in the 4th ending, and there are some real words in there but no actual sentences, so I'm 99% sure that it is incidental. Also the script in the palm of the hands in the picture above is in fact Hebrew, but like someone else has commented the fingers contain random scribbles and Japanese kana (I also speak Japanese lol). The script used in the picture from the Kabbalah is actually the exact same Hebrew font as the one from the other pic, just not the same letters. They use a font that is quite similar to the one used in religious texts.