A little foreshadowing, when the King first goes to the Poison Apple pub, a frog with ruby red lips asks him if she had met him before.

In the Fairy Godmother's workshop, Shrek dumps the giant cauldron of potion all over the employees and two of them get transformed into what looks like Lumierre and Cogsworth from "Beauty and the Beast" (1991).

When Mongo falls into the moat, The Gingerbread Man jumps in after him screaming "He needs me." Elliot yells the exact same thing when E.T. is taken away, in "ET: The Extra-Terrestrial" (1982).

In the end scene where all the characters are singing the Ricky Martin song, Puss-in-Boots does a spin, sits on a chair, and pulls a cord causing water to pour over him. This is a clear reference to the movie "Flashdance" (1983).

Shrek calls the giant gingerbread man "Mongo", and he talks just like Mongo from "Blazing Saddles"

If you have Shrek 2 with the extended ending, watch past the credits and you will see a guest appearance by Simon Cowell.

When Puss first sees Shrek and Donkey through the branches of the tree, the camera angle and "purring" sound effect are the same as the creature's viewpoint in "Predator" (1987).

The gate to Far Far Away is the famous Bronson Gate at Paramount Pictures Studio in Culver City, California.

When the police are chasing Shrek, Donkey and Puss in Boots, the radio dispatcher says "We are in a high speed pursuit with a White Bronco....." This is a reference to the infamous O.J. Simpson car chase in 1994.

During the first bedroom scene with the King and Queen, the king goes to stand on the balcony where he meets the Fairy Godmother. The queen asks where he is going, and the king replies: "Bit of trouble from the old crusade wound, gonna go outside and walk it off" while holding his knee. This is a reference to John Cleese's (King) character in "Fawlty Towers" (1975), Basil Fawlty, who has a war wound in the exact same place, and also uses it as an excuse to get out of a situation.

There is a reference to "Dinner for one" which I'm sure every German person knows when Shrek says the line "Oooo, ill kill that cat", its said in exactly the same way.

In the scene where the giant gingerbread man takes the "Starbucks" coffee cup, you see a crowd of people flee from that Starbucks to another one across the street. This refers to a joke made popular by Lewis Black. (more info here: Starbucks Joke).

As Mongo sinks into the castle moat after losing his arms, he tells Gingerbread man to "Be good", a reference to "E.T. - The Extra Terrestrial" (1982).

After Shrek lowers the drawbridge, Donkey gallops towards him. Shrek then swings up onto Donkey the same way Legolas does in Lord of the Rings: The Two Towers.

The potion that is supposed to make Fiona fall in love with Prince Charming comes in a bottle marked "IX." That means it's *Love Potion No. 9*, which was a hit for The Clovers in 1959. Love potion No. 9 is also a film.

Stay through the credits, and it will show a clip with Dragon and Donkey and their Dragon - Donkey babies. Submitted by BigOLB

After the giant ginger bread man's gum drop button is shot off, he lets out the same scream as Godzilla.

In the scene in the Fairy Godmother's workshop, there are two pictures placed next to each other. One picture is a profile of a mean-looking woman, and the picture next to it is of a profile of a witch. This is what Miss Gulch looks like when she transforms into the Wicked Witch of the West in "The Wizard of Oz" (1939).

When the kings men deliver Shrek the message, he calls them "Sergeant Pompous and the Fancy Pants Club Band", a reference to the Beatles' "Sergeant Pepper's Lonely Hearts Club Band".

In addition to the one already mentioned there are quite a few other hints at the King's previous existence as a frog: The furniture in his room is coloured green, the queen remarks that their first kiss was at the lily pond and this is where the Fairy Godmother threatens to send him back to, he calls the Queen 'Lilly' as in lily pad and his main reason for hating Shrek is that Shrek lives in a swamp (where he most likely had to live himself at one point).