Continuity mistake: When Kim and Shego stop chasing Ron back in Drakken's lab Shego is wearing a purple apron, then the camera moves away Shego and Kim then comes back and Shego is not wearing a purple apron, then the camera moves away again and then comes back to her and now she is wearing the apron.
Other mistake: In the scene where Drakken accidentally "clones" Bonnie Rockwaller instead of Kim Possible, he holds up a picture of Kim to compare the results of his experiment with the real thing. The Bonnie clone, completely encapsulated behind the glass of Drakken's cloning machine (as evidenced by the reflection of light off of it) somehow manages to get a hold of the picture despite this barrier. (She does this without having to break the glass.).
Number One - S1-E7
Audio problem: In the scene where Kim is running across grass-covered Japan to stop Duff Killigan, when she talks her lips don't move along to the words.
Low Budget - S1-E21
Continuity mistake: When Kim tries to find the Personnel Management room, the door is to the left side of the blue ribbon, but when it shoots to the next scene, it's on the right side.
Continuity mistake: At the end where Mr. Barkin was on the snowboard with Kim and her dad he was wearing a purple robe. When they see the class clapping it turns into his normal ski outfit. Then when the cop is putting D N Amy into his police car it changes back to the purple robe.
Continuity mistake: The phone Kim was talking on was blue, then she hangs up and talks to wade about Dr. Darken. After that she picks up the phone again and it's greyish with some yellow. (00:07:05 - 00:07:40)
Continuity mistake: At the end of the episode Kim and Ron stop in front of a door. The door handle is on the left. When Kim opens the door the handle is on the right.
Answer: Club Bananna, the clothes store from the show.