The scene where Malcolm and Stevie are in Malcolm's room and Reese walks in and is paranoid that the boys are plotting against him. Stevie's socks keep changing, between black (or dark) dress socks to regular white athletic socks. The socks switch back and forth between different angles during the whole scene.
After Lois goes to care for Ida and Hal serves Chilli for breakfast, he picks up and wipes his glasses twice.
When malcolm holds up the 20 dollar bill the back is facing lois but in the next scene it is now facing malcolm.