Opens with the quote, "A liar will not be believed, even when he speaks the truth." This is from Aesop's fable of the Shepherd Boy (who cried wolf).
Ava's hospital room number is 405. This is a running gag throughout this series. Many episodes will show a room number which reflects the season and episode number. This one is season 4, episode 5.
This was the first episode of the season in which the episode quote did not have a black background. This may have been done to represent Nick regaining his powers in the episode.
At about minute 19:20, there's a fly on the counter in the house when Nick and Hank are talking to the husband