There's an achievement for not missing any items but moving the screen usually resulted in a "guess." You can tell from the blue ring. To avoid that when I swiped the screen I would make sure to swipe my finger off of the screen.
Trying to remember... I would almost finish a stage and home out. Then go back in and it would start over and I could remember where the items were. As far as a walkthrough it's not really needed. Sometimes you have to manually select different tools but other than that it should be fairly easy. Is there a certain part you're stuck at?
I'm going to try to complete it, but I don't know. I never completed the retail version. Uno RUSH may be my final contribution this round. I'm anxious for next round. ANYTHING is better than these two genres lol.