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Continuity: When Odie comes out on the porch to keep Garfield company, his collar and tags are visible; even more so when he attempts to get back in. But when the shot pulls away to show Odie alone on the steps (before running off after the scooter), his collar is gone. Part of the plot hinges on Jon trying to find Odie, who wasn't wearing his tags.
Continuity: When Garfield rescues Odie and Happy Chapman picks up Odie he puts the shock collar on him. It then cuts to the dogs howling and then cuts back to Happy Chapman and you can see that the collar is no longer around Odie's neck but in Happy Chapman's hand. It then cuts back to the dogs and then back to Happy Chapman and the collar is back on Odie. He then starts to run and the collar is off again.
Continuity: Garfield has a thumb on his front paws, giving him 5 digits on the bottom of his paws. He is shown leaning on a window and all 5 are making contact with the window as a human hand would. The paw print that Jon finds and recognizes as Garfield's are normal cat prints with only marks from 4 digits. If his paw did have 5 digits as seen in the window, he would have left a 5 toed print.
Continuity: After Garfield takes treatment at an orphanage, he looks at a dog in a cage and jumps on the counter. In this shot on the counter you can see the comb, a bottle of shampoo and a jug of liquid soap. Look at these things when Garfield says 'But I've got somebody waiting', and you'll see that the comb has changed position on the counter.
Continuity: When they are doing the line up at the pound, there was more than one cat playing Happys cat. When they first put Happys cat down on the floor, you see his back is all black. But when the guard picks him back up he has a white spot on his back. When Happys cat hits the red button, his back is black again. This happens a few more times throughout the movie.