When the dog is in front of the metal dog statue he named Daisy, he pulls his head up out of the ground and has a ring of grass and dirt around his neck.
When he shakes it off and the grass and dirt fall to the ground, it disappears in the next shot.
When the dog is crying over the fact that Daisy is now turned into an artillery shell, you can see 6 smokestacks from the artillery factory in the far background.
After the dog kisses the shell (Daisy) it blows up.
The artillery factory in the background now shows only 4 smokestacks.
When the vicious dog pulls the sign to show the dumb mutt, the words 'Vicious Dog' have changed from black to red.
When the dog is calling for Daisy in the bomb factory, a hair appears on the right side of the screen and hovers over his head for a few seconds.