Mine had garlic, too, and the chopped stalks may have been garlic shoots. More difficult to tell after being stirred up.
A Google or Baidu image search shows a great variation in the complexity of the toppings. The menu picture at Pot & Noodle shows a much plainer version than what was actually served.
Interestingly, the Wikipedia entry for re gan mian includes a picture of a version from Henan that looks quite similar to P&N’s version:
