I sometimes see that a comma is not used before 'please' in such constructions. I wonder whether it is becoming accepted. Another word is etc. Someimes I see a comma before 'etc' and sometimes the comma is missing. E.g. dogs, cats, rabbits(,) etc.
To tell you the truth, I felt it should be there, but I wasn't sure, because it's not a sentence. I didn't want to say it was a mistake without being sure.
A careful, deliberate speaker might actually use a slight pause, but I don't.
I use a comma before "etc." but I consider it optional. This seems to fit in with the business about items in a series: the last comma be