When Veronica's hands are seen marking out Ron's sign-off, the paragraph above it is completely different from what we see Ron and Veronica reporting in the next scene.
After Ron and his gang have the big gang war with the other four news teams, he and his three co-workers are sitting in his office drinking some beers, and the amount of beer in the bottles change many times.
In Jack Black's scene, Black's motorcycle skids and stops behind Ron Burgundy's car. However, when Black and Burgundy meet face-to-face, the motorcycle is somehow in front of the car on the road.
When Ron is in the bar where he drowns his sorrows away, a man enters the bar in one shot and we hear and see the door opening. In the next shot the same man enters again and the door opens again.
At the anchorman rumble, just as they all attack, Brian Fantana stumbles and falls to the ground. Yet right after that, he's in the thick of the brawl.
In the scene at the Zoo, one of the cameramen is carrying a portable U-Matic video recorder but he is using a 16mm film camera.
When Ron is talking to Brian on the phone after the burrito scene, the phone in the booth is a touch tone. Touch-tone dialing was widely introduced to the public in 1964. Touch-tone phones, although not common, were found in some phone booths in the 1970s.
In the Jazz club scene, Ron plays the flute - yet the mouthpiece is clearly under his bottom lip, not on his mouth.
When Ron and the other Anchormen are ready to fight the rival news crew, a man is seen falling just as they all run towards each other.
In the Jazz club scene when Ron is moving towards the stage, several extras are clapping without their hands meeting, so as not to make noise on the sound stage during filming.
During the fight between Ron and Veronica, Veronica pulls an antenna off of the TV and whips Ron with it. Just before she rips it off, it moves, revealing that it was already broken.
After Veronica fills in for Ron, Garth lights a Cigar for Ed, however you can clearly see that the cigar hasn't been cut, making it impossible to smoke.
When Ron throws the burrito out his car window, we see the fallen motorcyclist eventually slide to a stop. The burrito is shown smashed on the pavement; stationary and beyond where the motorcyclist stopped sliding, revealing that the burrito had been placed on the ground before the scene was filmed.
Though set in the 1970s, during Ron Burgundy's encounter with the motorcyclist, a 1997-2002 Ford Econoline cutaway van passes by in the background.
Pandas were not introduced to the San Diego zoo until 1987, and no cubs were born until 1999.
In several shots of downtown San Diego's Petco Park, home of the San Diego Padres can be seen. Petco Park opened in April 2004. During the 1970's the Padres shared then called San Diego Stadium with the San Diego Chargers.
During the anchorman rumble, Champ throws a man through a car windshield. The car is a 1982-1987 Chevrolet El Camino. The quad rectangular headlights give it away. The movie is set in the 1970s.
At one point, the News Director announces that the ratings went up the previous night. Nielsen did not introduce overnight measurement in the San Diego market until the 1990s. In the 1970s (when the film takes place), the only source of ratings data were the 4 sweeps months, for which the data took several weeks to be made available.
In the "jazz flute" scene, the bass players left hand position and movements clearly do not match the music he is supposed to be playing.
When Ron blows fire from the end of his flute, the nozzle of the flame projector is clearly visible in one of the shots.
The view from the San Diego - Coronado Bridge when Ron Burgundy has his encounter with Jack Black is clearly not San Diego, but is in fact Long Beach, California.
When Ron reads the teleprompter with the question mark on it, it is revealed that the words on the prompter don't match the words that Ron said. The plot depends on the notion that Ron cannot help but read anything that is put on the teleprompter.
Directly following the "Panda Watch day #5" report, as Ron Burgundy is reading his sign-off from the teleprompter, the words do not match, defeating the plot point that he can't diverge from the teleprompter.
After Veronica Corningstone gets selected as the new co-anchor, the first newspaper spells her name "Cornerstone".
The events of this movie occur in the 1970s. When he first meets Veronica Corningstone, Ron claims to be friends with Edward R. Murrow, however, Edward R. Murrow actually died on April 27, 1965.
Just before the fight scene, Ron mentions no touching of the heads or hair. But Champ is seen punching someone in the face as well as Ron punching Wes Mantooth in the face.