MITM Mistakes
I Found These Funny Mistakes On IMDB and moviemistakes.com
In the Pilot episode (Season 1 Episode 1) Malcolm and Stevie are in his room. When Stevie is talking you can see the boom mic poking out at the bottom left part of the screen.
In Red Dress (Season 1 Episode 2) when Dewey yells for Lois because the bow was put on the present, if you look to the left of Lois, you will see a crewmember kneeling down, handing Lois the red dress, who is holding a bucket of water. He quickly gets out of the camera's view.
At the end of Lois vs. Evil (Season 1 Episode 9) Malcolm speaks to camera with several children moving in the background. One boy doesn't know where or when to move and he tries to speak to someone off camera. In the end he gives up, shrugs his shoulders and walks off.
At the end of Traffic Jam (Season 2 Episode 1) when the family have got back in the car Malcolm says something like "who would have thought a traffic jam could be so cool, we should do this again". Well near the end of the sentence we can see Malcolm's mouth and it isn't moving.
In Flashback (Season 2 Episode 25) When Lois goes into labour with Malcolm, she runs outside taking Francis and Reese with her. When Francis says, "You're a liar, you're a liar," watch the back window of the car and you will see the camera and camera operator's reflection in the window.
At the end of Zoo (Season 4 Episode 1) in the last argument scene where Malcolm and Dewey are in the tigers cage,if you look over Malcolm's right shoulder you can see a man with a camera filming them.