Making a mistake is awesome information for you, it is not a negative it helps you move forward, it does not move you backwards at all. Lots of folks are stuck in fear of mistakes and so they do not move forward at all with lots of things, dog training as well. So many of you are afraid of making a mistake with the dog and having a negative consequence from it.
The cool thing is that it is all just information to you about how you should move forward with your dog and your training.