The pseudo-zombie corpses are on page 18. You can look and see if you agree with me that they bear an uncanny likeness to the HOTD zombies. There's also a new bad guy in this chapter who fights with a spear like Rei's mother. Perhaps Shouji Sato wanted to show off some spear fighting he never got to include in HOTD before it went on hiatus. On the other hand, maybe I'm just looking too far into this, and it's all just coincidental.