Yes, I know that Japanese has a lot of variations. Just going between Tokyo and Osaka, even my uneducated ears could hear the difference. Japanese is so old a language, I beleive that it's origins are unknown -- that's bound to have a lot of dialects.
Okinawa (USN HM2 with the FMF) is where I picked up most of what little I know. The first phrase I learned was "Hai", with the obligatory quick bow of the head. Then the various forms of "thank you". Third was "gomenesai". $;-)
Ala so, deska. City Japanese.
Ala so, dambe. Rural.