Hi, 出入平安 is actually a common Chinese phrase which is quite simply a blessing for peace and safety in one's comings and goings. I don't think it's a reference to the movie by that name. Rather, it's referring to how Xiaotian has entered and exited Taotao's mouth safely.
Unfortunately, this is what "I can change him" looks like the vast majority of the time. Perhaps it's also why a lot of people stay in abusive relationships.
The "Xiao Wan Neng" in this chapter is a parody of the Xiao Huan Xiong (Little Raccoon) Crispy Noodles.
Just by removing the water radicals from 小浣熊 (Xiao Huan Xiong) you get 小完能 (Xiao Wan Neng) which doesn't have any real meaning as the words simply mean "Little End Able."