Stars seem to show up a lot, especially in the earlier episodes.
Fate, of course, is a recurring theme.
Apples - the universe. See episode 1, around 5:32.
Penguins - a link to the subconscious? (see below)
95 - reference to the 1995 sarin gas attack
Subways - reference to the 1995 sarin gas attack
Fairy Tales; Plays - I've been seeing these as symbols of delusion-- Ringo's, especially.
Drowning - Early on, there seemed to be a lot of arrows pointing toward this. Honestly, I included it because of
.
Cockroaches: Corruption beneath the surface of things. Apples also rot from the inside out.
Food; Oral fixations: There is a lot of food in this series, and I don't think one episode goes by where someone isn't eating something.
Animals - penguins aside, there seem to be quite a few animals showing up in this series, especially