There's also a recent chinese drama called Nervous, where the male lead is taiwanese and the rest are from the mainland. You can clearly hear how his accent is different from the rest.
Also there's the Beijing/standard mandarin accent, which has the famous 儿 sound (something like "er", 点儿,照片儿 dian'er, zhaopian'er etc etc), which they only have in northern China. In other places in the south, like Shanghai, they speak faster but some people find it easier to understand than the Beijing accent.