Sweet Tooth

[Drunk Monk]

True but there's a definite deadhead theme in this series. It's one of those shows, like GotG, Willow, and so many others, that relies heavily on vintage songs. In s1e7, the showrunners tipped their hand with 3 dead tunes: Truckin, FotD, and Ripple. 
The Shady Grove reference refers to a cassette tape case and you can see the cover which is the trees of the old Garcia/Grisman album. 

That being said, pareidolia is a great word. Props for properly deploying it here.