I wonder if entering a wrong information to rtpcr machine would really affect the results. For instance, wrong concentration or dilution factor when labeling the plate before the run.???
No, that information is for your own reference and subsequent data analysis. You can always correct the labels after the run. It will not affect the Cq. If you use the built-in data analysis function of the machine, then it may affect how the data will be analyzed. In essence, the plate labels are just "names" you give to your samples.