- The prototype of Shrek's appearance was the professional French boxer Maurice Tille, famous at the beginning of the 20th century.
Maurice was a very educated person, spoke 14 languages, wrote poetry at his leisure. But for 20 years he fell ill with a rare disease - acromegaly, in which bones begin to grow uncontrollably.
- At the beginning of the cartoon, Shrek brushes his teeth and looks at his reflection in a mirror, which then cracks. The exact same scene is found in Austin Powers: The Spy Who Seduced Me (1999), starring Mike Myers (the actor who voiced Shrek).
- When Shrek places a wooden sign "Beware: -E Ogre" (Beware! Ogre!). It does not have the upper left corner, and a little later you will notice that the right one is missing.
- The moment Shrek lets the Donkey go to sleep, he opens the door of his house to the inside. When Shrek throws the Wolf out of the house, the door opens outward. At the same time, in all cases, you can see how the door slams loudly at the moment of closing and does not continue moving further, resting on the jamb.
- The song "Welcome to Duloc", sung by wooden puppets at the entrance to Dulok, is a parody of Disney's "It's a Small World".
- Lord Farquaad's image was removed from one of the Walt Disney bosses.
- It took the artists 9 months to create the "best hair" for Fiona.
- In a fight scene between Fiona and Robin Hood's men, the action stops and the camera flies around the characters. This is, of course, a reference to The Matrix (1999).
- According to the creators, Princess Fiona's combat choreography is based on films with Jackie Chan, as well as Crouching Tiger, Hidden Dragon (2000).
- Originally, the cartoon lacked a moment in which Princess Fiona burps. It was decided to add this scene to the picture after Cameron Diaz burped on the sound recording.
- At the end of the movie, the fairies are shown transforming Blind Mice into horses, but seconds later, they are shown dancing on the piano keys.
- Fairy Godmother's character was created for the first film, but all episodes with her participation were cut out.
- Puss in Boots says "I hate Mondays" is one of Garfield's favorite expressions.
- On the wall in Fiona's bedroom is a portrait of Justin Timberlake with the words "Sir Justin" in it. At the time of the release of the cartoon, Cameron Diaz was in a relationship with Justin.
- Most of the paintings in the castle are portraits of real kings and queens. For example, in the hallway you can see the famous portrait of Queen Elizabeth II.
- Pinocchio's dance at the ball is reminiscent of Michael Jackson's famous dance.
- There is an allusion to the fairy tale "Beauty and the Beast": the workers of the magic factory, when processed with a potion, became a Clock and a Candlestick from this cartoon.
- Parodies of famous movie scenes can be seen in the film: The Lord of the Rings, Mission Impossible, Spider-Man, Indiana Jones, Marilyn Monroe's ballooning scene, Frankenstein (Mongo's revival), possibly Asterix and Obelix vs. Caesar (when the donkey catches his mouth bottle of potion).
- In the movie, there is a parody of the game Need For Speed, when Shrek is reeling from the cops on horseback.
- At the beginning of the movie, you can see that Prince Charming is left-handed. Further, it becomes clear that he is right-handed.
- The scene where Shrek appears naked in a dream in front of many children is very similar to the scene in the movie "New York City" with the Olsen sisters.
- In prison, when Snow White rips off the sleeves of her dress, she has a tattoo on her right arm. However, when she begins to sing in front of the two Ents, the tattoo is gone.
- This is the only Shrek movie that doesn't start with a book.
- After escaping from Rumplestilskhen's castle, the Donkey says to Shrek, "I won't ask why you are so sad ... why are you so sad?" - This is a parody of the Joker's line from the movie "The Dark Knight", where he asks "Why are you so serious?"
- In the finale, on the shelf where Shrek put the book, you can see another book with the title of the next cartoon - "Puss in Boots" (Puss in Boots).