Continuity mistake: In the episode when it's Kenan's birthday, Kenan and Kel are looking for Kenan's present in Kenan's parents room. As they're searching, Kel throws some of Kenan's parent's clothes all over the place. But then when Kel throws the snowglobe, there is practically no mess, but just a few clothes on the floor - less than before. Some clothes on the bed disappear as well.
The Raffle - S3-E3
Factual error: When the Rockmmores turn the new TV on, the resulting light is impossibly bright. (00:06:20)
Visible crew/equipment: When Kel gets up to get more water you can see one of the cameras.
Continuity mistake: In the episode where Kel is banned from ever going in the Rockmore house again, Kel sneaks through Kenan's window, scaring Kenan. Kenan jumps back in fright and knocks the lamp from his bedside table and it rolls onto his bed. However in the very next shot the lamp is suddenly back and upright on the bedside table. In the next shot the lamp is now back on the bed.
The Cold War - S1-E8
Factual error: The pilot that jumped at the end isn't descending fast enough to be real.
The Lottery - S2-E3
Continuity mistake: At the very beginning, when Kenan is shown in Rigby's, the clock changes from 8:00 to 9:25. (00:03:00 - 00:03:30)
Revealing mistake: The orange soda cans are supposed to be full but when they fall they are obviously empty.
Get The Kel Outta Here - S2-E8
Revealing mistake: When Mrs. Rockmore opens the door there is a painted house visible outside. (00:02:55)
Visible crew/equipment: When Kel is singing in the Orange Rain you can see stage lights reflected in his umbrella. (00:10:00)
Revealing mistake: The parrot is a very obvious stuffed toy.
Continuity mistake: During the filming of "Supermarket Cop 3," the time on the clock changes throughout. (00:18:00)
Continuity mistake: The amount of foot dust changes from when Chris come back to when Kenan grabs some.
Get The Kel Outta Here - S2-E8
Continuity mistake: Kel pushes Rodger on the table out the front door straight. However there is a wall there as seen at the start. But Rodger manages to go into the road. (00:06:35)
Continuity mistake: When Kenan and Kel are in Kenan's room there are 2 socks hanging out of the dresser the one on the left keeps changing positions.
The Cold War - S1-E8
Continuity mistake: Kel drinks a fair bit of Kenan's "medicine" but in the next shot the amount of "medicine" is greater than before.
Get The Kel Outta Here - S2-E8
Continuity mistake: Kel comes rollerblading in from the right of the door but there is normally a wall there. (00:02:50)
Get The Kel Outta Here - S2-E8
Revealing mistake: When Kel throws the masseuse, it is obvious he lands on a crash mat due to his height when supposedly on the floor. (00:06:30)
The Cold War - S1-E8
Revealing mistake: Cold War: The drill hole Kenan makes at the start is larger than the drill bit.
Continuity mistake: Kel comes into Rigby's and sits on the counter and takes of one of his trainers, after he has been handing out fliers. He puts it on the counter so the sole of it faces the camera all the time, yet during shots it suddenly changes so that the top of the trainer faces the camera.
Answer: He's simply enjoying doing it himself. Especially since he likely believes he can do it better than she can.