When Hal takes the axe from Chad, Chad offers the axe with the cutting edge towards Hal. Change camera, and we see Hall take the axe with the cutting edge facing away from Hal.
When lois is making the smoothie the plug changes sockets.
First it is in the bottom one then it is in the top one then it is in the bottom one again.
First it is in the bottom one then it is in the top one then it is in the bottom one again.
In the preamble, Malcolm & Reese are outside of the toilet. The wall by Malcolm is sometimes in direct sunlight and sometimes in shadow.
The way lois is searching the box changes multiple times. First she puts a green folder in the box near the back and starts thumbing trough it but in the next scene she is now thumbing through the middle of the box and there is a blue folder standing up in the box but in the next scene the folder is gone.
When hal is holding the book and the red pen his hand changes constantly. First it is near the bottom of the page but in the next scene it is near the top and in the next scene he is holding the corner of the page and in the next scene he is not.
Chad says that pictures of things should be with the things in the picture. He fixed a picture of Lois onto Lois's back yet there is a picture of Hal hanging on the wall and NOT on Hal.