Other mistake: Rory asks Emily for baby pictures of Lorelai, but Emily says Lorelai burned them all because she had such a big head when she was little. But in "Love and War and Snow" earlier in the season, Emily, Richard and Rory looked at a baby picture of Lorelai in a bunch of petticoats the night Rory stayed over with her grandparents during a snowstorm.
Other mistake: The Warner Bros. Studio Tour building is quite a distinctive high-rise, and it's located at the corner of Avon and Warner Blvd across the street from the Warner Bros. Studio backlot, which includes the location set of Stars Hollow town square. During the series, in a few episodes such as "Will You Be My Lorelai Gilmore," that high-rise building can be seen from the town square, past Doose's Market, directly behind Sophie's Music store.
Other mistake: After Lane goes home, when Rory watches her mom talking to Max note the short window over the kitchen sink behind Rory (not the tall window on the same wall). In the next shot, from outside that short window, we see Rory pull the photo strip out of her pocket then proceed to walk to that window and stand directly in front of it. The problem is there should be a sink and cabinets under that window blocking Rory from standing beside the window. (00:43:05)
Other mistake: When Rory and Lane get caught at the movies, Lorelai said she will not lie to Mrs. Kim because she has to respect that Mrs. Kim doesn't want Lane to do something. In reality, Lane is allowed to do things Mrs. Kim would not approve of all the time i.e. Listening to ungodly music, eating pizza, wearing different clothes.
Other mistake: Paris was looking to find the seedy side of Stars Hollow. Inside of Luke's she hid behind a menu commenting that she wanted to blend in. She then asked Luke if he gets a lot of truckers. We have all seen the exterior of Luke's and the town square. Paris has walked through it. Where, would a big rig possibly fit or park? Paris is extremely intelligent. She would not have asked the question. Doing so was totally out of character.
Other mistake: Rory is seated on the front steps of Dean's house. A car pulls up to the curb. Dean gets out of the passenger side of the car. But we didn't see, is anyone get out of the driver side or going into the house. I am assuming that Dean's mother or father picked him up. If that's the case, then why didn't they pull into the driveway? Had he used a car service, he most likely would not have been seated in the front seat.
Other mistake: Though I love the 21st birthday at the casino plan, it's flawed. Rory will not be able to play blackjack until she is 21. She can't be playing when she turns 21. Casinos, to the best of my knowledge, won't let you on the gaming floor unless you are 21. She has to turn 21 first.
Other mistake: After Emily goes to the pool house on the pretence of looking for a blouse, she asks Logan about plans for Rory's birthday. Later, Emily and Richard talk. Emily suspects that Rory is ready to have relations with Logan. She says that she caught them getting cozy on the couch. Emily didn't catch them doing anything. There was no way for Emily to see inside. Both Logan and Rory got off the sofa to answer the door. Emily didn't see anything. And, Logan told Emily that he had no plans for where his birthday. He knows that Emily is planning a party, yet he offered to take Rory away for her birthday. Emily would've been devastated.
Other mistake: Lorelai is in bed post breakup. Rory returns from running errands for her. She comes upstairs with Frank who is carrying the television. Frank puts down the television and leaves. When Rory leaves, Lorelei turns on the TV. No one plugged it in or hooked up the cable, assuming that cable is installed in her bedroom (which is extremely doubtful). Lorelai would not have been able to flip through channels as she did.
Other mistake: Lorelei, Rory, and Luke are about to leave for Emily and Richard's wedding. Babette is on the sofa half passed out from the bachelorette party. When she hears Lorelei speak her name her head pops up to say goodbye, and she also comments that Luke looks nice. Luke is wearing a long overcoat. She could not possibly see how he looks, plus she was viewing him from behind.