-- When they are playing basketball at the YMCA, first we see Carl smash one backboard, then we see Skinner's team start running from one whole backboard to the other side of the court where homer smashes into another whole backboard.
-- When Homer is kidnapping the kids, he puts Ralph in the back of the van, but in the next scene Ralph is sitting next to Homer even though there are bars separating the back and the front of the van.