Other mistake: In the second season episode "The Car Salesman", notice the license plate on the real estate agent's truck. It is the same license plate that is later used in the season 5 episode, "The Ski Lift".
Other mistake: When T.J. types in his height instead of Floyd's while searching for his dad's date on the computer, he never pressed the "Enter" key.
It's a Mad, Mad, Mad Hotel - S1-E12
Other mistake: In the episode "Its a Mad, Mad, Mad Hotel", when Esteban has his dream of becoming rich and London becoming his "Bell Girl", he calls the hotel "Hotel Esteban, but London's uniform still has a "T." When it cuts there is an "E" on the front desk.
Where in the World Is Pookie Stevens? - S3-E2
Other mistake: During the yard sale, in the first shot of Donnie's area where he has all his sports stuff, the sign behind him reads "Donny's Corner". "Donnie" is misspelled here. In all the shots after this one, there are sneakers, or some other equipment hanging over the "y's", hiding the spelling mistake.
Knighttime - S3-E2
Other mistake: When Abby uses her phone to show Eric the pictures that Sven posted on Instagram, her phone states it is 11:26pm when you can see it is daylight after they walk back into Eric's room straight after. (00:05:00)
Other mistake: Hawk gets a mohawk, but his hair was too short to style it like that.
Suggested correction: The mohawk was not a prop, but the actual hair of the actor they shaved off and mended together for him.
That is true, it was the actor's actual hair, but in the realm of the show, Eli's hair was not long enough to style that large of a mohawk out of it.
Other mistake: Jane Webb is listed in the closing credits as "Store Lady". She actually played the "Story Lady". (00:25:00)
Kitten Kong - S2-E7
Other mistake: When Twinkle (the kitten) is up the tree, Tim starts to throw up sticks, and, as a result, a big log falls on him. The 'log' is plastic, and is a completely different colour from the rest of the tree.
Other mistake: When Jimmy goes looking for the Kettlemans, he climbs up the Sandia Mountains but finds them in a flat forested area. To get to a level forested area in the Sandias, Jimmy would have had to climb all the way to the top, which would be suicidal, because the area of the Sandias he goes into is extremely rugged and steep, plus he goes in there with nothing but a suit. Even the Kettlemans would be insane going that same route with two kids, a tent, and camping supplies in tow.
Other mistake: When Harold goes to kill his father, we see his dad on the seat moving each time we hear the hammer, but if you look at his head, you don't see anyone hitting him at all.
Episode Four - S1-E4
Other mistake: Jake is sitting at the kitchen counter top and is watching TV whilst doing his homework. You can see his red pencil case labelled 'Jake Rowlings'. Many times throughout the series the parents have been recognised as Mr and Mrs Brockman - not Rowlings. The children also have been referred to as Karen Ben and Jake Brockman. (00:13:40)
Suggested correction: Throughout the series, the Brockmans (specifically Pete and Sue) seem very ashamed of their family. In the first episode they tell Jake to give people Grandad's address. It doesn't seem out of character at all for them to tell Jake to give people a false surname. Also, Harry Potter came out at the same time so Rowling would be a very easy surname to choose. This isn't out of character for the parents at all if you look at the rest of the series.
The family's surname is not mentioned (other than on the pencil case) at any point in the first series. Likewise, the grandad is not named in the first series either. Sue even says she doesn't know anyone called Frank Morrison during Series 1 when Pete mentions a colleague of that name. This creates continuity errors when the family are given the name Brockman and Sue's father is established to be called Frank Morrison from Series 2 onwards.
The Germans - S1-E6
Other mistake: When Basil shuts Manuel in the burning kitchen and slams the door, the walls shake.
Other mistake: King Boz helps put out a fire with an extinguisher that is not operating; there is no mist exuding from it yet the flames go out.
Other mistake: In the beginning when Jess is showing the guys her outfit for Cece's party, you can see she is wearing blue platform high heels. She walks in them just fine. But the next day, when she's filling in for Cece, she's given platform high heels and can't walk in them at all. (00:02:37 - 00:15:17)
Come Back, Little Googie - S1-E25
Other mistake: When Eddie's naughty little friend goes to shake hands with Herman they insert a quick close up of a hand buzzer in his hand, only it's obviously an adult's wrinkly hand.
Other mistake: In the starting titles, the newspaper clippings state that Doogie sails through high-school in 9 weeks, the article says he is 12 years old. The next clipping says he graduates from Princeton at age 10.
Is Lupin Burning... ?! - S1-E1
Other mistake: The logo of the evil organization, Scorpion, contains just a little misspelling. It's missing the R. (00:02:50)
Other mistake: It is previously explained that Jake cannot grow a moustache, then a few seasons later Jake goes to prison and grows a moustache.
The Man in the Long Black Coat - S2-E8
Other mistake: Eric Idle is called Dr Melvin Whale, but according to the subtitles he is called Dr Melvin Mile.
Other mistake: As LeBeau is being interrogated, on the barometer behind Schultz you can make out the word "fair." What is a barometer labeled in English doing in a German counter-intelligence headquarters?