In A Goofy Movie, during the scene where the car is rolling down the cliff and into the water and Goofy and Max are arguing, at one point Goofy says "You even lied to me!" But when did Max lie to Goofy in the movie? The closest I can think of is him changing the map, but he never actually told Goofy any lies regarding it. He just changed the map. He never told Goofy that he didn't change it (though I guess there'd be no reason to if not asked).
I've noticed that "you even lied to me" line comes after Goofy reveals that Max's principal called, so when I was younger I figured the lie happened sometime before the trip, but there's still no known instance of Max lying about his last day of school.
I can't remember if I've brought this up before, but has anybody noticed how on the last day of school, PJ is worried that Pete might find out he was using his camera, and after going to the principal he's really worried about facing his father... but after the bell rings he seems to have snapped out of it and is happy for Max and Roxanne (was the point of putting on that show for the school to get Roxanne to like Max or to make the other students think Max is cool?) and we never exactly know if Pete had yelled at his son over it - the next we see them they are camping, which is what PJ had been wanting according to Pete.