What is the goal of peer review in the scientific method?
It is to verify the results of an experiment.
In order to verify results, the same experiment must be carried out in order to see if similar results occur.
The best example of this is the creation of the super-heavy elements such as Roentgenium, Darmstadtium, Flerovium and Livermorium.
Because these elements are so unstable they only exist for brief moments of time (sometimes less than a second). So in order for universal agreement of the existence of these elements, verification must be carried out by the means of repeat experimentation.