I'd say that a common error with visual aids is confusion/misunderstanding. People can sometimes be confused with a visual aid, sometimes due to sight-impairment or misconception.
-Pepetreefrogthe2nd
Do you have picture you could post of this question
Answer:
1.You can't have the flowers delivered tomorrow because it's a public holiday
2.The store will give your money back provided you have a receipt
3.Sophia wouldn't have had an accident if the roads hadn't been icy