Continuity mistake: During Marty's drive to the bogus address, when he is done speaking with Monty, just as he says, "Wolf out!" he pulls the phone wire and the earpiece actually pops out of his ear, but in all of the following shots that earpiece is still in his ear. Since the super-glued earpiece is one of the main plot points, this is bizarre to say the least. (00:44:25)
Continuity mistake: In the scene where Jason's parents arrive at the airport in Los Angeles his mother is wearing a brown jacket. It remains brown until the scene where Jason meets his parents at the set and his mother's jacket is maroon. While she has more than enough offscreen time to change jackets, she does not have a jacket to change into (they are driven straight there) and no reason to change the jacket.
Other mistake: When Marty Wolf gets out of his pool, his shorts aren't dyed blue. If that one little bottle of light blue dye was enough to dye Marty Wolf's skin, it certainly would have dyed his shorts.
Continuity mistake: Before and after Marty's appearance at the birthday party, his car's five-point star hubcaps are visible in close-ups. After Marty's encounter with Masher, when the car is towed its hubcaps are entirely different. (00:44:50 - 00:50:25)
Visible crew/equipment: After Frank's limo "stalls" during the first step of phase four, when Frank tries to hug Marty just before Jaleel shows up, in the shot facing the back of the limo the reflection of the boom mic (with its fuzzy wind cover) is visible on the limo's surface.
Visible crew/equipment: In the first step of phase four, after Frank's limo has "stalled", when Jaleel drives off with Marty who shouts, "Sayonara, loser," in the next shot and two shots later the reflections of a crewmember (wearing shorts) running backwards, other crewmembers, the boom mic, camera and equipment are all visible on the limo's surface. (01:05:30)
Plot hole: When Marty Wolf comes out of the pool he is blue from head to toe yet with all the swinging of his hands and dancing, let alone the mirrors in the hall, he does not notice he is blue until he has put orange dye in his hair. How could he miss it?
Factual error: The super glue (after sitting that long) wouldn't be wet enough for the earpiece to stick almost permanently to Marty's ear.
Continuity mistake: When Jason leaves Marty's limo he exits from the left side of the limo, on the driver's side. In the next exterior shot, he is leaving from the right side of the limo, the passenger side, which is the side Marty sits on. (00:15:47)
Factual error: The amount of dye from the bottle couldn't possibly make Marty's entire skin that deep a shade of blue.
Continuity mistake: The degree of blueness and orangeness of Wolf's skin and hair keep changing. Right before the first birthday party, he has bright orange hair. Yet when he leaves the birthday party, his hair is a duller orange. I don't think that hair dye wears off that fast.
Continuity mistake: Jason and Kaylee arrive in LA on Thursday, and phase one begins Friday morning, but during 'phase one: surveillance day', when Jason and Kaylee are at the stunt demo, Jason looks at Marty's iPAQ PDA and the date reads Sunday, June 4th (stunt demo noted between 12:30 and 1:30pm). Yet, when Vince, the stunt coordinator, tells Marty that he's taking the next day off (day of 'phase two') to take his granddaughter to a birthday party, the clown invitation notes July 28th as the day of the party. Then, on Saturday 'phase two: the take down', when Jason is seated at the bus stop he looks at Marty's PDA and the date reads June 22nd, the day of the 'Whitaker and Fowl' premiere and party. Go figure... (00:35:50 - 00:52:40)
Continuity mistake: At the premiere of Marty's failed movie, he is asking the president if he can explain his "breakthrough" on Big Fat Liar. The president raises his hand, and says "One chance, Wolf, that's all I'm giving you." It remains raised until two shots later (on Marty's line "strap on your seatbelt because you are about to be blown away,"), when it is suddenly resting at his side.
Continuity mistake: The morning of 'phase two: the take down', when Marty awakens at 6:45, in the close-up he lifts the snug ice-pack mask to his forehead, but in the next wideshot the mask has vanished though he hasn't touched it. (00:39:40)
Continuity mistake: Just after Jason's parents leave, when Rudy pulls up to pick up Janie the front passenger window is rolled up, but when Janie and Rudy turn to head back to his ZR-2 and he says, "Peace out, little G," that window is rolled down. (00:15:10)
Continuity mistake: When Marty is talking to the studio's president about his 'incredible breakthrough' about BFL, Monty has her head leaned up against a chair. Marty continues talking when the camera cuts to a close-up of Monty. With no time in between shots to move her head, her head moves about 6 inches away from the chair.
Continuity mistake: At the very end, during the credits of Jason's 'Big Fat Liar' premiere, you can see Jason's mom over his shoulder wearing a spaghetti strap dress with a shawl around her shoulders. The shawl moves on and off her shoulder between shots.
Other mistake: When Marty Wolf is chasing Jason on the cart, as they drive through the winter set you can see the fake snow get on the camera lens.
Revealing mistake: After blue-Marty exits the pool he heads upstairs and when Jason and Kaylee spy on him dancing (with Mr. FB) Marty's entire body is dyed blue, but the blue only reaches to just above the bottom of his bare feet.
Continuity mistake: When Jason writes his paper, we see the handwriting of the title "Big Fat Liar", etc. Later, in the limo when Marty finds the story and when Jason is in Marty's office, we see the paper again and the handwriting differs.
