After Nancy gives the blondie to the hospital worker, he calls her back to give her the information she needs. The shots facing Nancy show the napkin empty without the blondie on it. The shots facing the hospital worker show the blondie returned in the same spot again.
When Inga shoves some of the cupcake on Corky, you can see that the cupcake has been untouched.
At the lunch scene, we see how messily the girls eat; knocking over bottles and the food all over the table, but when we see it from another angle, everything is tidy and perfect.
When Nancy is talking to Ned on her porch, her yellow hat ties in the back in the over the shoulder shots, but near the front in other shots.
When Nancy was chloroformed in Chinatown, the thugs stopped their SUV in the exact spot where Nancy's car had been parked. When Nancy escaped from the theater her car was back in that same spot.
The sign outside the church in the opening sequence appears to say "Calvary Presbyterian," and Nancy refers to "the pastor," which is consistent with a Protestant church. However, in the sanctuary, there is religious statuary, and Nancy disguises herself as a statue of the Blessed Virgin (with an amazingly handy bit of fabric in the traditional blue which always adorns Mary in traditional religious art). Presbyterians come from a strict Calvinist tradition that eschews statuary as idolatry, and they don't pray to Mary.
During the chase scene between Nancy Drew's Nash convertible "roadster" and the bad guys' Range Rover (starting at 1:20:20 on DVD), the Range Rover bumps the Nash three times. Nancy Drew's head snaps forward when physics would dictate that her head would first snap backwards (i.e. whiplash).
In the 28th minute when the boy is choking, Nancy performs CPR rather than the Heimlich Maneuver. CPR is used when someone has stopped breathing.
After Nancy escapes the Presbyterian church, she is greeted by a Catholic priest wearing a collar. Presbyterian pastors do not wear this type of collar.
In the 29th minute there is a mailed envelope in the scrapbook, whose addressee zip code is six, rather than the standard five digits.
When Nancy spends her first night at the home in Hollywood, there is a digital clock/radio on her bedroom nightstand. In the next scene, it has been replaced by a old-fashioned wind-up alarm clock, which awakens her. Nancy mentioned she likes old-fashioned things. It is possible she took the alarm-clock which had been there and replaced it with her own.
When Nancy dives to the ground to try and get out of the way of the explosion, the mat does not fly up. The mat (which has been shown in behind-the-scenes clips on the DVD) is bright blue. The color of the object that flies up with a tan, manila-like color. Notice that it is the same color of Nancy's coat. The object that flies up is merely Nancy's jacket flap.
When Nancy is printing out the details of all the possible matches on the 3 adopted children; although the names in the left column of the pages are different, the list of addresses in the right column is the same on each sheet.
Nancy answers the phone even though there is no ring.
Nancy loads a VHS tape of "Twilight in China" into the VCR to look for the clue in Dehlia Draycott's movie. The tape is rewound to the beginning when she loads it - yet it immediately jumps to the "Make the dragon bow" scene; which, according to Dehlia's lines, is most likely in the middle or at the end of the movie and nowhere near the beginning. Even if it's a prologue, Nancy still should've had to fast forward through the previews that came before the movie.
In the 4th minute Max is handed a flip phone by the police officer, with Nancy on the line. After speaking with her, Max pockets the phone and does not return it to the officer.
In the 29th minute there is a mailed envelope in the scrapbook, whose commemorative postmark reads 'Langley ROVER NASA'S FIRST ROVER ON MARS.' There is no such rover, but this may be an example of poetic license.
In the 40th minute Nancy bribes a records keeper with a brownie. He calls after her as she's slowly walking away, "Did you make these?" It is one brownie.
In the 35th minute Nancy open a magazine to an article with no byline.
When Nancy, Ned and Corky peer into the newly discovered secret passage from the attic, a spotlight is visible hanging behind them. It is also included in the ink drawing of that shot in the credits.
Nancy is told by the real-estate agent that a house involved in a murder mystery would be more expensive. These are actually known as 'stigmatized properties' in the trade and are usually worth less, not more.
Nancy Drew says the Miranda Warning started in 1963. It was actually the result of a ruling in June 1966.