What I enjoyed:

Lan Sizhui: He has grown more capable and stronger since The Untamed, but remained true to his character.
WWX: I enjoyed the WWX references and cameo
Wen Ning's song: nice to hear his song at the end credit

What I didn't enjoy:
Subtitle: the text was white which made it difficult to read
Wen Ning: He didn't seem like the same character from The Untamed. He's definitely more mature, intelligent, and serious in the Living Dead, but there wasn't much of an explanation about how his development.
Lan Wangji: There were many WWX references, but only 1 for Lan Wangji. I was expecting Lan Sizhui to mention him at least once.