One thing that was advised to me: Get the cable/internet provider out there to tack the cable to the fence before the dig. The cable is fairly shallow (couple inches) in the ground and even if it isn't in the way of the pool, having a bobcat or other equipment drive over it could cause it to be severed.
Excellent point. I think those flags will be run over or buried by the second day and the cable location forgotten. Lots of things underground become casualties even when marked.