In the "Dance the Dance of Life" scene when peter stumbles on the table, one corner "dips" into the floor then flies away by it'self, and after he crashes into the bookshelf various bookshelf parts are seen to move into the floor as well. Likely an animation oversight.
When Peter is in Angie's home, Angie's right hand is black from not washing it since she last saw Peter and her left hand is gloved. After Peter leaves and Angie starts hugging and speaking to the toilet her right hand is gloved and the left hand is black.