Continuity mistake: 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 mistake: In a scene where Maria and Max are talking inside the restaurant, right before they are about to leave, the shot changes from her having her purse on her shoulder, to it not being there.
Continuity mistake: 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.
Continuity mistake: In the scene at the new restaurant, every time they show the case of wine bottles, one bottle is in a different position. One time it is cockeyed in the case and the next it is correctly in the case.
Continuity mistake: While sitting on the bench, near the lake, when Grandpa is telling John about out living everyone by eating bacon and smoking everyday, he has a cigarette in his left hand and a beer in his right hand. After a few minutes, when it switches back and forth from Grandpa to John, the cigarette and beer switch hands and then back again, between shots. (00:09:00)
Continuity mistake: When Jack & Walter drive to the fishing spot instead of the wedding, the exterior shots of the car show the Dodge Polara as a 4-door pillarless hardtop. When the interior of the car is shown, it is a four-door sedan, showing the thick pillar seen behind each man as they converse. As they speed back to the wedding, the four-door sedan now appears in a couple of exterior shots, and now the hardtop is used during interior shots of both men through the windshield.
Continuity mistake: When Max is eating his mac and cheese it changes camera shots rapidly. In one shot he's got some mac and cheese on his fork, in the next shot it's gone and the fork is clean. It does that a couple of times.
Continuity mistake: When Maria dumps the pot of red sauce onto Max and John, the first shot has her nearly emptying the pot. When the camera shifts to Max and John, the sauce keeps flowing in large amounts after the pot should have been empty.
Continuity mistake: When Max and John are sword fighting with fishing poles, the sun angle changes constantly.
