I also have heard くらはい = ください. Try pronouncing "kudasai" while brushing your teeth or having something in your mouth, it will sound like "kurahai".

I have also seen stuff like です→でう
e.g. もーいっぱいでう＾＾＾＾
and 楽しみましょう→楽しみませう

Is the last one due to old-style pronounciation?　I find it very interesting. for example よう→やう in some cases apparently. like きょう becomes けう or けふ as in the poem いろはにほへと.　有為の奥山今日越えて = ゐのおくやまけふこえて or something like that
Wasn't tokyo called とうけう or とうきやう or something like that.