Crashed UFO at the bottom of the ocean - one of four flying saucers that you can encounter in the game. To find it, you are going to need a submarine.
A crashed plane - At the bottom, you will find here a planewreck. Around here, there also is a bag with $12.000 inside.
A face - You can find here a face painted on the slope of Mount Chilliad. You can only admire it while flying, e.g. a helicopter by.
UFO on Mount Chilliad's peak - Another flying saucer. To see it, you first need to complete the game in 100%. The saucer is only visible at 3 a.m. during a storm (it is best to use a cheat code to change the weather)
A ghost - On Mount Gordo, Between 11 a.m. and the midnight, you can find the ghost of a murdered girl and a bloody caption reading JOCK. Once you come close to the apparition, it will disappear. If you search for information, about Lenora Johnson (by finding 50 letter-scraps you solve the mystery of her murder), on the web, you will find a link referring you to another story ("Blood on the Rocks). You can learn from it about the allegations that Jock Cranley, who is a current candidate for senator in SA, murdered his wife by pushing her off the cliff. After you start a string of missions where you need to obtain celebrities' belongings, also Trevor is taken for Jock Cranley by a couple scavenging in the trashcan.
Thelma i Louise - arguably one of the best Easter Eggs around the game. When you are flying in this region around 7 p.m. and 8 p.m. (this does not happen if you are on the ground) you will witness an exact reenactment of the legendary scene from the Thelma and Louise movie ending.
UFO over Fort Zancudo - Another flying saucer. Very high above the clouds. Requires you to complete the game in 100% first.
Beam me up! - In the skate park in Sandy Shores You will find a mural with the famous quotation from Star Trek.
A stone and a poem - On one of the stones, you will find eights and a poem engraved - "One is done, Two was fun, Three tried to run, Four called mom, Five's not alive, Six is nix, Seven's in heaven, 8 won't wait". It is an allusion to Freddie Krueger's poem in the Nightmare from Elm Street movie series.
UFO over Sandy Shores Yet another flying saucer. It is very high above the clouds. This one also requires you to have completed the game in 100%.
The Hatch - at the bottom of the ocean, you will find a bunker hatch from the LOST TV series. There is some light inside, which is an allusion to the episode entitled Deus Ex Machina, where there light turned o after hitting the hatch.
The Playboy residence - an exact copy of Hugh Hefner's residence. In the evening, you can find a lot of scarcely dressed girls at the back.
Car Tune Network - Right next to the strip club, you can find Car Tune Network garage, which is an easter egg alluding to the Cartoon Network TV station.
Graffiti in Chamberlain Hills - On one of the buildings, you can find a huge mural reading "Welcome Back - We missed you last time". The person on the painting is wearing Grove Street Gang stripes. This is, of course, an allusion to GTA: San Andreas. Close to this one, you can also find a Nyan Cat graffiti, who is the main character in the famous meme and a YouTube movie.