When Garfield wakes up, that day is Monday. However, when the newspaper gets printed, it states that it is Thursday.
In one shot when Bonita argues with Wally, Zelda is cooking Kat-Kreal Stew, and in the next shot, she's carrying a tray of sandwiches and is making them.
When Billy Bear first goes into the Bonitanator, he gets stuck in the doorway, yet later in the film, he manages to go in and out of the Bonitanator without any trouble.
When Garfield said the day is Monday at the beginning of the movie, the local newspaper ("The Herold Chronicle Standard Times Picayaue Press" is dated on Thursday November 9, 2006.
When Garfield enters Eli's control center, the dining room set of the "Life Stinks" comic strip is shown on stage. After Eli stops Garfield from controls, the dining room set has putted away above and the screen curtains open. When the "Life Stinks" comic strip is being photographed, the screen curtains is closed and the dining room set returns where it originally placed.
The local newspaper is dated on Thursday November 9, 2006, but on the second panel of that day's Garfield comic strip the copyright is dated 2007.
When Eli first sees Garfield and Odie in the burning hotel, he says "What?!" yet his lips don't move.