I don't think there are any appendices. the contract you've posted seems to have everything one would expect, and to be missing the stupid things that you would fear.
If there's no agreed overtime rate, that's a plus. You can negotiate your own on a student by student basis, or find your own students. Overtime rates in contracts tend to be something ridiculous like Y80 an hour, whereas you could charge Y200+ an hour.
If the Unis in the north, the heating will be probably be automatically on half the year and off the other. In it's in the south, there's probably no heating.
There's really nothing missing. You just need to get clarification on the residence permit thing. Its a pain in the arse if they're going to expect you to pay for it.
Are they going to pay for the medical (in China). That would be about another Y400, and you'll need it for the residence permit.
Basically though, there's no problems with the contract. Its all about the relationship with the employer, and FAO in particular, anyway.
I used to be a contract manager, and the only problem I've ever had with a contract was solved fairly easily by me and another foreign teacher (deliberately) taking diametrically opposite interpretations of a contract clause, at which point the employer resolved the problem to our satisfaction. Honestly, the shorter and simpler a contract, the less opportunity there is for abuse.
The one potential hazard is the probation period. This is almost certainly nothing to worry about. The Uni is giving you a job 'sight unseen' and I guess they want protection in case you're an absolute freaking nightmare. You would have to be an AFN to lose your job, because if you're simply a poor teacher with a difficult personality, that is the norm for China.
However, assuming that you're a good teacher, there are some things which, if they apply to you, you should keep quiet for the first 3 months. (Including most definitely in any replies on this thread).
Sexuality - if you're gay, then you should probably not go out of your way to tell everybody for the first 3 months. Just in case.
Disability- if you have anything, including depression or any other kind of mental illness. China's mostly cool with people being gay. Disability; hell no. Staggeringly ignorant in fact.
Drinking - One of our members was ill the other day, but everyone ignored her because they assumed she was drunk. When you go into a shop, they will hazard a guess that you want beer. They think we're all alcoholics. Probably best to be cautious about being seen buying alcohol for the first 3 months, or resting in a drunken-like manner in public. (At my last Uni a teacher was seen with a bottle of wine in his shopping bag, and as the DOS I was asked if he was an alcoholic).
Tattoos - Not many Chinese people have tattoos.
Best not to give any fuel to the Uni's wild prejudices for the first 3 months, just in case.