At the end, during the scene of the family photo, Hal changes the background to the beach. After Lois gets mad, Hal changes it back to the autumn background. Then it cuts to Dewey for a split second, and the background is still the beach background.
Hal goes to grab a beer. He tosses the bottle cap on the counter next to a phone book with one bottle cap already on top of it. You hear the sound of the bottle cap hitting the counter, but as he walks back outside, two bottle caps are seen on top of the phone book and none on the counter.
In the sequence where Reese and Malcolm are playing ball in the street without Dewey, lighting equipment can be seen on the edges in the widescreen DVD, like in the episode where the scene is taken from.