When Malcolm and Julie are having lunch, Julie's right arm is alternately on top of her Tupperware container/resting on the table in front of it.
In the cold open Hal returns to a work table outside the house. On a change of camera several items have moved. Notably the thermos flask, the jar of nails and the circular saw guard attachment.
When hal is eating the fruit out of the can he puts the fork over his arm but in the next scene it is in the can.
On arriving at the pageant Francis & Stanley are in full dress uniform. Both have two stars on their jacket epaulettes. Later without the jackets, Francis has no rank on his shirt epaulettes. When making paper flowers, Stanley has three stars on his shirt epaulettes.
Francis gives Tanya a back massage. Sometimes her back is fully uncovered. In one shot her top is closed over her back.
At the very end of this episode (Malcolm's monologue), a kid tried to enter the 4:3 frame from the right but is prevented from doing so by instructions from the crew and is seen mouthing questions. After 5-10 seconds, he quits trying to get on camera and goes to drink from the water fountain. As the DVDs use the 16:9 ratio, the whole thing can now be seen very clearly.
When Lois gets fired from the store, the boys play with the carpet cleaner, the front of Malcolm's shirt goes from covered in foam to barely around the edges.
At the end of the episode, 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.