In Legally Blonde (2001), Elle graduates from Law School in 2004, yet in this movie they make several references to the fact that it is 2003.
The door of Congresswoman Hauser's office states that she represents the 10th District of Texas, but her web site states that she represents the 31st District of Texas.
Elle graduates in 2004 and we see a pregnant Paulette in attendance at the ceremony. When Elle is in Washington, she makes a phone call to Paulette and we see Paulette's daughter, who appears to be about 3 or 4, which means this should be taking place in around 2007 or 2008.
When Timothy puts his snap into the Snap Cup and then Elle picks from the cup, she picks up Timothy's but says she gets her own.
While Elle is standing in the Congresswoman's office for the first time we see her take off her gloves but in the next shot, her gloves are still on.
The chamber that the House of Representatives meets in does not have assigned seating or desks at every seat.
The "Hopper" in the House is attached to the side of the Clerk's desk, not sitting atop it.
Elle Woods' license plate is not a legal Massachusetts plate. Plates in Mass have only 6 characters including spaces, her plate has 8.
In the scrapbook of the opening sequence, there is a page with "First day at Harvard" spelled out in Scrabble pieces. The value of the tiles are not correct Scrabble values, as A has a value of 2 (should be 1), V has a value of 12 (instead of 4), R is 7 (instead of 1), etc.
One of the plot line gags is that Bruiser and the Senator's dog are gay. A male dog may mount another to prove dominance, however there are no recorded instances of gay dogs in real life.
You see a crowd of people on the Capitol steps as Elle enters the Capitol Building. In fact, all of the buildings on Capitol Hill are connected by halls underground and people who visit and work at the capital almost never go from one building to another above ground.
Well Elle first arrives the animal testing center, V.E.R.S.A.C.E., there is no-one in her car as it drives up.
In the opening, there is a reference made to Elle Woods crying at the age of 3 whenever she was taken to BabyGap. BabyGap didn't exist until 1990, when the character was probably about 9 or 10. Even GapKids didn't open until 1986, well after the character would have been 3.
In the hearing for Bruiser's Bill, Elle puts Bruiser in his bag on the table beside her. You can hear her say "my best friend" but as there's a cut to a close-up of Bruiser, you can see Elle's lips in the right hand corner, forming the words "my best friend" silently.
The first time Elle introduces the Snap Cup, she is holding the cup in her right hand and paper in her left. When it comes time to snap she makes a snapping motion with her left hand while still holding the paper and a snapping sound is heard. There is no way her fingers could actually make the snapping sound with the paper in the way.
There is a palm tree visible out the window of the V.E.R.S.A.C.E. facility, even though it's supposed to be in Massachusetts.
When Congresswoman Rudd announces that she isn't going to back Bruiser's Bill, people are scrambling about and using their phones. The woman sitting behind Elle is using hers upside down.