Goof: In the beginning when Didi, Stu, Grandpa, Tommy, and Chuckie run to the garage, Didi's 'Mud Mask' only covers her face. But, a few seconds later, it's on her neck and the inside of her bathrobe, too. However, in the next shot, it's only on her face.
(When Chuckie looks in the fun house mirror)
Chuckie: Uh-oh. I think I'm gonna throw up.
Grandpa: Back in my day, me and my brother Sparky, went trick-or-treating, but it was 15 miles to the nearest house, and we had real tricks, and real ghosts!
Grandpa: In my day, we would find herds of elk living in our garage!
Grandpa: And me and Sparky weren't scared of nothin'!
Trick-or-Treaters: (off screen) Trick-or-treat!
Grandpa: (panics) What?! What?! What was that?!
Tommy: Come on, Chuckie, don't be a baby.
Angelica: Reptar bar, Reptar bar, the candy bar supreme! The candy bar that turns your tongue gre-e-en!
Grandpa: In my day, our dog would stay outside, wind or shine, rain or snow! It would be 15 below and it wouldn't matter!
Minka: Have fun at your bowlink!
Boris: Make many spare tires!
Minka: Ach! These mutnick babies don't understand a word you're saying, Mr. Storyteller!
Tommy: Someone, or something, is making trouble.
Lil: Or something?
Tommy: Yep! Something...bad!
"Monsters in the Garage" is also available in book form.