Continuity: Jack Lemmon puts the cat in Walter's truck. We see a close up of the cat's paws scratching holes in the car seat. A long shot shows the cat picking at the seat again, but there are no holes in the seat anymore.

Continuity: When Grandpa is singing a lullaby to Ally, her hair is across her forehead. In the next shot of her sleeping, her hair is neatly tucked behind her ear.

Revealing: When Catfish Hunter swims away at the end, you can see the shadow of a crew-member or some sort of device operating the puppet fish, under the water.

Revealing: When Catfish Hunter jumps out of the water towards the beginning of the movie, you can see that the splash of him landing in the water is actually in front of where he actually lands.