Textual Criticism Texts - The Gypsies Metamorphosed by Ben Jonson (1621)

Jonson's masque about gypsies who go from being dark-skinned to light-skinned and become much nicer in the process. Umm…

The Gypsies Metamorphosed exists in various printed editions and in manuscript versions. Why do you think Textual Critics take all of these versions into consideration when editing the play?

How does the play vary from one version to the next, and what does this suggest about the way that various printers or others "interfered" with the text?