Harry Potter and the Prisoner of Azkaban - Buckbeak
In the scene where Harry approaches Buckbeak to see if he can ride him, Buckbeak's rear end is just in view. As Buckbeak starts to walk towards Harry, look at his bottom, and you can clearly see the animal which was merged into Buckbeak pooing.
And this is a slip-up how? Are we to believe that hippogryphs do not poo? Plenty of animals relieve themselves when facing the unknown--either through nervousness or to give an impression of dominance or other reasons.
As already explained in the other report of this scene, this wasn't a slip-up -- it was a deliberate joke by the CG team (it was the CG hippogriff which pooped, not the animal which stood in for it during filming).
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