Malcolm throws a ball at Stevie and has three left in the bag. Then throws another STILL leaving three in the bag.
Francis feeds a carrot to the horse. In one shot he has no firearm, change camera and he has one.
When Francis feeds a carrot to the horse he is close to a trash can. As Otto speaks a single sentence, Otto, the horse & Francis are several yards from the trash can.
Reese is reading Lois's dairy in his room. He is reading the middle of it and puts it down to ask Hal a question. But when he picks it back up to read it, he is reading at the end of the book.
On the basketball court, Stevie is in full sunshine then not.
When Stevie won't let Malcolm help him with his depression, Malcolm gives up, saying, "Fine! Be a jerk!" In the DVD version (distributed only in the UK for Seasons 2 through 7), "Be a jerk!" was removed, leaving Malcolm only mouthing the words (though the background music continues through the scene, indicating it's not a technical glitch).