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Billy makes it to the school and is seated in class when Marmaduke passes by outside even though he pushed Marmaduke ahead of the bus and Marmaduke should have made it to the school first.
Marmaduke's sheriff's badge is on the wrong side right before he gets hit with the boulder.
Marmaduke's tail disappears briefly in one scene.
When Heathcliff is leaning on the fire hydrant, it's in the middle of the road.
Crazy Shirley's ponytail is missing in the last scene.
When Heathcliff swallows the fish bone, his eyes are orange instead of white.
When the alligator hits the armored car, the top of his head is beige and it should be green.