What actors and actresses appeared in Monkey Business - 1920?

There seems to be a misunderstanding. There is no film titled "Monkey Business" from 1920.

There are two films with that title, but neither is from 1920:

* Monkey Business (1931) - This is a pre-Code comedy film starring The Marx Brothers.

* Monkey Business (1952) - This is a comedy film starring Cary Grant, Ginger Rogers, and Marilyn Monroe.

Perhaps you're thinking of a different film? Could you please provide more information?