In the online ad, you can often just click on the item you want and add it to a list and often circle it too so you know you have added it.
On the list you can add notes such as I possibly wanted get turkey from the Deli Meat so added that.
This is what it looks like if you are wanting to print it out. It has the notes, quantity, and sale price. It is broken up into section to make it easy when shopping.
Now if I am only getting a couple items out of the ad - I won't print a list but I do find it helpful to go through all the ads and compare prices, circling the things I normally get or feel are a good deal so I can compare things more easily.