Other mistake: When PJ tells Gabe about the attic, he said he had never heard of the attic. But in the earlier episode "Charlie Shakes It Up" Amy tells Gabe to clean out the attic while she's away.
Good Luck Charlie (2010)
1 other mistake - chronological order
Continuity mistake: The Duncan family is forced to stay in a hotel while their termite devoured house is fixed. Dad draws up a sketch and is showing it to the family. When he brings his sketch in to show everyone, he is holding a black Sharpie, which then disappears and becomes a yellow mechanical pencil. Then the Sharpie returns for a bit, then changes back into a pencil again. (00:05:45)