Inspector Gadget walks away from the outside mail box drop and two seconds later he drops straight down from the top of the screen.
The key that was hanging off the left fake deer antler hat on Claw's cat, has switched to the right ear when Brain tries to get it.
Rudolph is the reindeer who is supposed to have the red nose, yet all Santa's reindeer in this special have red noses.
As Penny gets Brain to get to Santa's control tower, elves suddenly materialize out of thin air climbing up after her.
Even though Penny is driving the Gadgetmobile to Santa's workshop at a fast speed, the perspective doesn't change, indicating the car isn't even moving.
Inspector Gadget complained earlier while falling from the sky with his parachute, that it was too slow and that he'd freeze, yet in the end he rides up with Santa higher into the sky where it would be colder and has no additional clothing on. Likewise Brain is still naked.
Dr. Claw says Inspector Gadget is the only one who can stop him, yet Claw doesn't even bother to lock the front door to Santa's workshop.
Despite what the title says, at no point in the special does Inspector Gadget do anything that saves Christmas; Penny and reindeer do it.