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)
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)
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: Near the beginning, when Jason is done writing his paper he staples it. When he and Marty are in the limo, the pages are not stapled.
Trivia: Director Shawn Levy has a cameo during the "Whitaker and Fowl" party after the premiere, as the first guest bashing Marty's movie. (00:52:50)
Continuity mistake: When Marty is done speaking to Monty while driving to the bogus address, after he pulls on the phone wire, in the shot from his car's interior we can see that the wire actually ripped, but after nearly colliding with "grandma" the phone wire is again intact. (00:44:30)
Continuity mistake: During phase four, when Marty opens the passenger door of Jaleel's speeding car he wears a baseball cap, but in the next wideshot his head is bare as he hits the ground and rolls - the baseball cap is gone, it didn't fall off. After a close-up of Jaleel, it cuts back to Marty and the baseball cap is back on his head just before it falls off, as he continues to roll. (01:06:40)
