The line "Dry salty plums!! End of the world sale!! Everything must go!!" was written after the creative team decided that Mr. Ping (James Hong) would take serious advantage of Panda Village (financially speaking) when the giant spider Zhizhu (voiced by Jeff Bennet) arrived, causing village-wide panic.
When Jing is losing to Jindiao in his mind, he appears bigger in frame. When Jindiao begins to lose control in his mind, and Jing gains the upper hand in the fight, she appears bigger in frame.
The avalanche proposed an interesting dilemma for the VFX team. They were limited to three shots where the audience could actually see the snow moving across the scene. It would have taken too long (and cost the production too much) to animate more.
Giant pandas do not hibernate because their diet doesn't allow them to build enough fat reserves for the winter.