Continuity mistake: When Garfield is entombed within the pyramid, Odie comes along and frees him by dislodging one of the pyramid wall's stones - the second one nearest the corner. But when viewed from Garfield's perspective an entirely different stone is missing from the wall, about two spaces closer to the wall's center. (00:12:15)
Continuity mistake: As Garfield first jumps onto his chariot, a whip and holder appear from nowhere. (00:06:55)
Continuity mistake: When Garfield chases after a pink cave cat, he bumps head first into the caveman. Between shots, Garfield moves a few feet away from the caveman. (00:03:25)
Continuity mistake: When Garfield introduces the Operations Data Index Elements (O.D.I.E.) system in life number 9, "Elements" changes to "Element" and several buttons vanish from the control panel between shots. (00:40:30)
Continuity mistake: During life number 8, Jon introduces Garfield to Odie. Garfield's tail vanishes and then reappears intact in the shot where Odie licks his face. (00:36:05)
Continuity mistake: When Garfield is in outer space asking the computer to tell him if he's really living in life number 9, his armchair vanishes for an entire shot. (00:40:00)
Continuity mistake: In life number 3, Uncle Todd wipes the blue paint ring from Garfield's face and then places him upon a pink dotted mushroom near two paint cans. But between shots, both paint cans disappear. (00:13:50)