Originally Posted by 8 Ball
The fly episode was very symbolic. Especially the part where Jesse is at the top of the ladder trying to get the fly, whilst Walt ''supports'' him. Basically the episode is conveying that Jesse is put into difficult and dangerous situations (on top of a high ladder almost falling) because of Walt (Walt being so determined to kill the fly).
Exactly. It may not have advanced the plot, but the imagery and the meaning of the episode's events are great.