In Chapter 1, Barney ties Pugsley's leash to a pillar to work, & accidentally forgets he left Pugsley there.
Pugsley is found by Norma at the end of the workday, who shows disapproval towards this around the same time Barney realizes on his own that he forgot Pugsley, immediately running to go get him.
Chapter 3 features two panels with hallucinations that may trigger trypophobia in some readers.
The Watcher's character design features many little spots, possibly scars or rot holes, that may also trigger trypophobia in some readers.
No, but Chapter 3 features some scary hallucinations of the characters' bodies being rotted & bloated, as if they died from drowning/had their bodies tossed into the sea, which might be too disturbing for some readers.