(At around one hour and nine minutes) Master Croc leaps onto the boat and lands in a wide split position. This is a characteristic move of Jean-Claude Van Damme, who voiced him.
Lord Shen (Gary Oldman) fights hand-to-hand with a martial arts style called Cai Li Fo, a Chinese martial art that normally uses a metal fan for defensive and distraction purpose. However, being a peacock, Lord Shen uses his large tail feathers for that purpose instead.
During the first shot of Mr. Ping's restaurant, he says that it serves both noodles and tofu. This is a reference to Kung Fu Panda (2008), where Mr. Ping stated he previously had a dream of running away and learning how to make tofu. Apparently, Po realizing his dream, convinced him to do the same.
Lord Shen's wolf army had a much more tender backstory than being simple-minded mercenaries: the lore of the movie states that the wolves were the palace's royal guards, and that Shen, as a young Prince, was the only member of the royal family to play with the wolves, feed them, and basically treat them as his own kin, which bought him the wolves' loyalty and devotion.
After Kung Fu Panda (2008) was released, DreamWorks Animation planned a second movie with the subtitle "Pandamoneum", which was changed by 2010 to "The Kaboom of Doom", before simply being retitled to "Kung Fu Panda 2".