At the beginning of the movie, Alex is wearing very high, sharp stilettos (there is a close-up of them when she lands after doing a leap over the table). But a little later, when the Angels jump out of the window and roll down the hill to get away from the Mongolians, her heels are chunky and short.
While Seamus is holding Dylan in the air by her throat after they had stolen the rings, there is a close-up of her chunky shoes. Later when the three Angels are breaking out through the roof, they are all wearing heels.
At the beach, Natalie is chatting with the surfer while Alex and Dylan are under the car collecting his items. The camera cuts to the girls under the car and you can see the surfers legs in the towel, yet he is supposedly in the car already about to drive off.
As the Angels walk across the grass at the observatory, the sprinklers turn on and they're obviously getting wet. But, in the close-up after the car explodes, they're all dry and the sprinklers have switched off again.
When Madison is on the roof of the Los Angeles Theater she looks into the telescope pointed at the Roosevelt Hotel rooftop and it looks as if she is looking down at everyone getting busted by the FBI. In the next shot it is obvious that the Roosevelt Hotel is a much taller building.
The girls are escaping Seamus and the O' Grady clan. When Alex and Natalie jump into the speedboat, Natalie has flat shoes on. However, earlier while the girls were fighting, her boots were heels, not flats.
During the opening, the screws of the box that Alex is hidden in are located away from the box's edges. After the box cover is open, the box is quite thin and screws located that far away from the edge would not hold the box together.
As Alex, Bosley and Natalie are looking through Dylan's box of possessions, the cover of The Beatles compilation album 1962-66 can be seen. The orientation of the cover changes between shots - the barcode appears and disappears.
When the Angels are dancing to "Hammer Time" and all three leap onto the sofa and tip it over, Alex is wearing high wedge sandals. When she falls into the sofa after it flips over her bare foot is visible.
In the opening sequence when the Angels are escaping the Mongol headquarters, Ray Carter is standing behind Dylan when the bullets start flying and the girls start their leaps to crash through the windows. In the shot of the beginning of the leap, Carter is nowhere to be seen. The next shot of the characters crashing through the windows to the ground, Carter has crossed over somehow to be exiting not only the same window as Alex, but is ahead of her.
The slide on one of the two Desert Eagle pistols that Madison is using at the observatory locks back, indicating that the last round has been fired. One second later, the slide is forward again, without any reloading.
The surfer's towel and feet next to the car under which Alex and Dylan are lying. Then he gets into his car. In the next shot Alex and Dylan are again under his car with the surfer's feet and towel still in front of them.
When Dylan is thrown off the Los Angeles Theater, she lands on the big E. She is seen falling and she first hits the top of the E and grabs the bottom, but in the next shot she is seeing holding the top of the E.
While rescuing Carter, Natalie breaks into the tank by punching the driver's side window with her fist. But for the rest of the sequence, the window frame is clean, as if it were rolled down, and there is no blood on Natalie's hand.
When Seamus delivers the briefcase to the old black man, his bodyguard is behind him with his right hand just inside his coat on his left breast pocket. In the next shot, the bodyguard has his arms crossed.
In the O'Grady warehouse the Angels find a metal tray full of rings and want to identify the titanium rings that are intermingled with the rest.
To do that, they fill the tray with champagne, lecturing: "If an object has a lower density than the liquid in which it is immersed, it will float." Pure titanium has a density of roughly 4.50 grams per cubic centimeter. Champagne is a mixture mainly of water (0.99975 grams per cubic centimeter), alcohol (0.79 grams per cubic centimeter), carbon dioxide (the 'bubbles', 0.198 grams per cubic centimeter) and some sugar. Champagne has thus a much, much lower density than titanium. They would therefore never be able to float to the champagne's surface as they do in the movie.
The Thin Man seemed to have been killed in Charlie's Angels, but is back alive. McG has explained that this seemingly superhuman quality is the tongue-in-cheek mystique of this illogical, larger-than-life character.
The Sony TV that Alex carries into Natalie and Pete's house is an obvious hollow plastic model; there's a hole in the speaker near her right hand that shows it's hollow on the inside. Also, the remote control on top of it seems to be glued on top of the model. The way the model is being carried, it should fall off.
The goof items below may give away important plot points.
After the fall, when the sprinklers turn on, they all have bullet holes on their shirts. When they are walking, Dylan no longer has a hole on hers and after the car explodes neither does Alex and Natalie.
When Madison shoots at the Angels at the observatory, Natalie is in the middle with Alex to her right and Dylan to her left. However, when they land on the grass over the wall, Dylan is in the middle with Alex to her left and Natalie to her right.
As the girls walking toward the car, there are getting soaked by the sprinklers. When we cut to an overhead shot of the girls and the car just before the car explodes, there are no signs of the sprinklers or the water.
The Angels' showdown with Madison was such that each required medical attention, especially for the glass shard stuck in Natalie's belly, yet shortly afterward, they put on fancy clothes meet Bosley at the premier without a scratch.