Due to a breakdown in cellular function, male octopuses only have a few more weeks to live after mating. Meanwhile, octopus eggs take several months to hatch, so it is virtually impossible for a male octopus like Timothy to be alive and have children at the same time. However, it's not uncommon to refer to unborn/unhatched offspring as "children" all the same.
At 42:42 words "Russian kitchen" are misspelled in Russian language. Letter Y is used instead of Cyrillic "U" (which even IMDB does not support) , while it is correctly used on the window).
When Frenchie is putting on his nicotine patches, the scars on his upper left arm are visibly make-up department glue-on prosthetic scars, the outline can be seen around them as they haven't been blended properly with the actor's skin tone.
Frenchie can be seen walking through the streets of New York. Behind him is a big sign for the store "HomeSense". HomeSense only operates in Canada, and would be called HomeGoods in the United States. This makes sense, as the show is often filmed in Mississauga and Toronto.
The Deep is repulsed with the idea of eating creatures from the sea. Yet most creatures from the sea, have, as a food supply, other creatures from the sea.