Anachronisms: Letters on a desk in the lawyer's office have 33 cent stamps showing the US Flag and a skyscraper, which were issued in 1999. The real Erin Brockovich did her work (and the movie is set) in the early 1990s, when the first class postage rate was 25 cents, and later 29 cents.
Continuity: Immediately after their first meeting with a PG&E attorney, Masry and Brockovich return to his office where we see him loosen his tie. After we cut to Erin, we return to Masry, whose tie is back in place. Next time it's loose again.
Continuity: The first time that Erin visits the Water Board archive, the photocopier has a blue start button. When she returns later, the start button changes to green.
Continuity: The coffee stain on Masry's shirt after tripping over the box of files appears, then disappears when he goes to talk to Erin.
Continuity: Her old car is hit in the right rear and spun around. The gray "primer" is on the door with no damage to the rear of the car.
Anachronisms: George and Erin's kids are playing the "Harley-Davidson" Edition of Monopoly which was not released until 1999.
Continuity: In the meeting with the young PG&E representative, the paper Ed puts on the table in front of the guy changes position several times.
Continuity: The bowl of chips in front of Beth in the "Finding the kids at George's house" scene changes position several times.
Anachronisms: When Erin and Ed are driving along the highway in his Mercedes, a current generation Mercedes-Benz E-Class flies by them; this model didn't come out until 1996.
Anachronisms: When Erin and Ed are in the park deck, a current generation Mercedes-Benz E-Class (W210) can be seen as they walk by. The model was not available before 1995.
Incorrectly regarded as goofs: While the beginning of the film is set in the late 80's, the poster of Jurassic Park (1993) in Erin's bedroom isn't seen until 18 months after Erin began working on the case in 1992.
Continuity: When Erin is ringing up companies looking for a job puts the phone down twice after the last phone call.
Anachronisms: At the picnic there is a can of Diet Coke that has the 1997 style, rather than the 1986 design used in the early 1990s.
Audio/visual unsynchronized: After Erin comes up from the PG&E well with the water sample, she is chased to her car by two PG&E employees. She gets in and frantically tries to make her getaway. Apparently the car doesn't start the first time and we hear her trying again. However, when we hear the starter cranking the second time, Erin's hand is already off the ignition switch and moving to the gearshift.
Continuity: In the accident, Erin's car is seen being hit broadside by the doctors car obviously running though a red light while she was driving straight across the intersection, but in the telling of the accident in court Erin says that he came around the corner, out of control, as she was "slowly pulling out" of her parking space. In the visual, the doctor is clearly the guilty party but in Erin's courtroom testimony it appears that Erin pulled out of her parking space unsafely into the path of an oncoming cornering car.
Anachronisms: When Erin confronts George about his loud Harley, the motor clearly sports an oval air cleaner cover identifying it as a Harley Twin Cam which didn't come out until 1999-2000 (depending on the model) - several years after that scene would have taken place.
Revealing mistakes: When the kids are playing what appears to be the card game War with George after the "Erin finds the kids with George scene", as Erin is telling the kids to go to bed, the children get up, and the son says "Good night, Aaron", when referring to George. Aaron is the actor's name, Aaron Eckhart.
Factual errors: In the movie, Erin claims to have been Miss Wichita as a younger woman. The real Erin Brockovich was in fact Miss Pacific Coast.
Errors made by characters (possibly deliberate errors by the filmmakers): When Erin and George are sorting out the various decks of playing cards, she asks him how many decks they have. George responds, "We have more than we-nuff", an obvious combination of "more than we need" and "more than enough".