I've noticed that there aren't any words in Spanish that start with sp. Latin words are altered to include an e in front of the sp. Even loan words are often modified to esp...: spaghetti => ...
It seems that some people pronounce words that end with -n almost as a "ng" sound. "Bien", for example, seems to come out as "Bie[ng]". Is this a regional issue? What regions use this ...