The Rum Went Away

I was assigned to make this video using the common mouth pictues to create the illusion that my 'mouth' is moving to the words in the sound file. I really liked this project, but I didn't do the pictures right. I tried not moving, but I still did so the picture 'jumps' a lot, which is a little motion-sicknessy.
I plan on doing this again, but I'm going to put in a new background bc i think that's what's 'moving' to make the background jump.
Any tips for my next attempt would be nice! :D