The soda can on the counter top changes position when Michael is talking to Lindsay, even though nobody touches it.
As Lucille chases Buster out of the kitchen for fear of lighting his hair on fire accidentally, the grocery bag Lucille is unloading is crisp, and a fruit bowl on the countertop can be seen with oranges on top, with a banana tucked underneath. After Buster leaves, the bananas are now on top of the bowl and the paper bag is crumpled. A subsequent shot a second later finds the bag restored to its crisp demeanor, and the bananas, while on top, have now magically turned over.
When Lucille is unpacking the groceries, which include the disguised gold bars, she unpacks a bottle of "Bushmills", a Northern-Irish whiskey - However, the bottle appears to be filled with a clear liquid - not whiskey. Either that, or the bottle is empty.
In the clips where Buster is seen running back into his mother's apartment to escape Lucille Austero, the entire wall visibly sways back and forth each time Buster quickly closes the door.
When Michael and Lucille enter the restaurant for the second time for Lucille's surprise birthday party; right when Michael opens the door, on the left hand side of the screen, lighting used for the show is visible.
The narrator calls G.O.B. Lucille's fourth-least-favourite child, but given Lucille's statement in the "Pilot", "I don't care for G.O.B.", he actually means her first-least-favourite, or her fourth-favourite child.