Other mistake: When Sheila was eating Gary she bit and chewed his entire finger only then to later find that Dan had found that exact same finger in their yard.
Santa Clarita Diet (2017)
1 other mistake in season 1
The Farting Sex Tourist - S1-E4
Continuity mistake: Joel takes a grilled cheese to Abby in her room. He takes a bite, hands the sandwich to her, and she takes a bite. In the next cut, the sandwich is sitting on the plate, untouched.
Joel Hammond: Okay, we say we came across this murder site and we're just cleaning it up.
Sheila Hammond: Who cleans up murder sites?
Joel: I don't know. We're Mormons?
Sheila: Mormons don't clean up murder sites.
Joel: Mormons are helpful.
Trivia: At the comic book store, when Eric and Abby are talking, there is a "Plants vs Zombie" comic on the rack in front of them.