While in the zombie services office, Liv tells Clive "you know nothing, Clive Babineaux". This is a paraphrase of the popular Game of Thrones saying, "you know nothing, Jon Snow". Clive, being a huge Game of Thrones fan, would instantly get the reference.
Liv cooks Max's brain into a steamed something with yellow stuff. That is "Spotted Dick", a steamed sponge (made traditionally with suet but always with raisins) and custard, one of the archetypal British old school desserts.
This isn't Daniel Bonjour's first time on a zombie show. Aside from playing Liv's smuggling friend Levon in this series, he has also been on a few episodes of the Walking Dead.
Daniel Bonjour (Levon Patch) has worked with David Anders's (Blaine DeBeers) real-life girlfriend, Devin Kelley in the TV show, Frequency (2016). They played Daniel Lawrence and Julie Sullivan respectively.
Robert Buckley (Major Lillywhite) has worked with Daniel Bonjour's (Levon Patch) real-life wife, Jelly Howie in the TV show, One Tree Hill (2003). They played Clay Evans and Taryn respectively.