Continuity mistake: The box of Marlboro cigarettes next to Buster's [Kiefer Sutherland] left hand did not have a lighter on top of it, but there was a lighter atop the pack after an angle shift. Buster was holding a newspaper with his left hand and had a cigarette in his right, so the lighter just suddenly appeared. Seconds later, the lighter was gone. (00:04:34 - 00:05:02)
Continuity mistake: John Ritter's beard goes from being real to fake throughout the movie.
Continuity mistake: Tanya O'Tabby's dress sleeves come and go when she's speaking to Sam Spayed (Garfield) for the last time. (00:25:00)
Continuity mistake: When Angela gets in the Flying Wing's cabin, she grabs the metal frame with her hands. In the next shot, her arms change position and her hands are no longer holding the frame.
Continuity mistake: When Hulk Hogan as Rip begins complaining that the limo driver is going the wrong way, the driver activates the barrier to the passenger compartment, which appears to be opaque. When the shot cuts to the limo driving down the road, however, the trees in the background are visible through the front windshield, which means the view through the rear window isn't obscured when it should be blocked by the barrier. (00:13:48)