Continuity: When Martin shows Tim the alien gum, it's sealed under glass. But when Martin takes out the Venox 7 gum, the cover is gone with no time for it to have been taken off.

Continuity: When Lizzie puts the Venox 7 gum in her mouth, she starts chewing it right away. But when she takes it out of her mouth, it's in one piece. To drive the point home, when she is in monster form, there is nothing in her mouth.