For the TV series:
- Actor Allusion: It isn't the first time B.D. Wong has played a psychologist.
- Fake American: British actor Jason Isaacs plays an American Detective.
- Fan Nickname: From before the first episode we had "Green World" and "Red World" for the two realities which only later on the official website have been dubbed "Rex's World" and "Hannah's World."
- Ascended Fanon: In the final episode, Britten is trying to explain what's going on to Dr. Lee, and audibly starts to refer to the other reality as "green" before stopping mid-sentence.
- Hey, It's That Guy!:
- Lily Tyler is Britten's wife
- George Huang is Dr. Lee
- Mr. Sikowitz killed a girl in the Green World.
- Sophia is the captain at Britten's precinct and seems to know more than she lets on.
- President Allison Taylor took up counselling after being forced to step down.
- In another parallel universe, Rex was Jack Shephard's son.
- The brother of the Green World murder victim in "Game Day" was Adam Rove.