Revealing mistake: Of the different cats playing "Panda", one that did not get along with the black cat was chosen for the fight - and the black cat was actually attacking Panda, who was hissing while in a defensive position (on its back, using front and rear claws to try to protect itself and get the black cat to stop). The safety of the two cats fighting was "sacrificed" for purposes of making the movie (a no-no!). A different cat was most likely used for the more playful pawing between Panda and the black cat. (00:04:33 - 00:05:28)
Revealing mistake: There's definitely more than one cat playing "Panda", but how many can't be determined because Panda's entire body is not shown at once. "All" of them (maybe a whole litter?) have various distinctive black spots on a mostly white body. Watch for the amount of black on a cat's face and whether or not the diagonal black fur on the right side covers the entire eye or only half and if there's a black spot toward the nose. Also, look for how much black is on its side, back, behind its legs, etc.
