1.The polar bear sitting in the corner of the play pen that appeared in this questionable DriveShaft shoot.
2.If you stop it at exactly the right time, you can see Jesus appears on the cross inside the smoke monster when it encounters Mr Eko.
3.The numbers on the back of this girls soccer team.
4.And on the roofs of these cop cars.
5.The pattern on the ceiling above Michael's head.
6.On the raft, Michael says to Jin, "No, no, no. This one goes there, that one goes there". This is identical to a line Han Solo says to Chewie in The Empire Strikes Back.
7.Walt's face on the side of this milk carton.
8.The name of the company that made this pregnancy test from Season 2 episode, "The Whole Truth".
9.Widmore Labs also seemed to make the hot air balloon Ben (aka Henry Gale) claimed to have crash landed on the island.
10.Hurley making an appearance on Korean TV.
11.And when Sayid appears on the TV behind Kate in Season 2.
12.The polar bear and the word "namaste" appearing in this artwork on Charles Widmore's office wall.
13.The island that the Oceanic 6 claim to have survived on is called Membata. Membata-bata is an Indonesian word meaning to be in doubt or to be ambivalent.
14.The Dharma logo on this shark.
15.In "Homecoming" Charlie steals from a woman who mentions that her dad is buying a paper company in Slough. A nod to Wernham Hogg, David Brent's company in The Office.
16.How Locke and Hurley had the same boss – Randy.
17.In Season 3 episode "Flashes Before Your Eyes" a man is crushed to death by falling scaffolding. All you can see are his red shoes, in a nod to The Wizard of Oz.
18.The funeral parlour in which Locke's body is kept is called Hoffs/Drawler. This is an anagram of "flash forward" – a clue to the reveal at the end of this episode.
19.While we're on anagrams, in "The Little Prince" Ben drives a Canton-Rainier Carpet Cleaners van. This is an anagram of "reincarnation".
20.Juliet is hired by a company called Mittelos Bioscience. Mittelos being an anagram of "lost time".
21.And Ethan Rom is an anagram of "other man".
22.In Season 2 we see a copy of An Occurrence at Owl Creek Bridge, a book about a man who evades death and has a series of adventures, but then at the end it turns out it all happened in his mind in the moments before he died.
23.And finally the symmetry between the first and last shots of the show.