When Aldo, Bill, Ed, Oly, and Waddle, are at the decoy cafe drinking Milkshakes, Aldo had a Vanilla Milk Shake, then when Aldo explains the Legend to the Ducks, His MilkShake Is supposed to be visible from the camera angle, but all there is was Ed's empty glass and Aldo's MilkShake was nowhere in sight.
When Aldo goes to get a glass of milk, he seems to drink the whole glass before Quack the Ripper appears behind him. When he turns around he drops the glass and it seems to be full like he never drank out of it.
When Bev and Bill walk towards Ed, Oly, And Waddle in the Decoy Cafe, 2 of the ducks sitting in the booths to the right of Bev, and Bill Don't have Bow ties, in the next scene, they appear to have red bow ties Just like Bill's.