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Anyone involved in room acoustical measurements for the first time will probably find more than once that measurements turn out in a different way than expected or intended. One of the major problems during a measurement session is the often unavoidable time pressure, imposed by owners or builders of the room to be measured. In particular when you have to carry out many measurements in a relatively short time span, a simple interference or disturbance of any kind or insufficient insight into the acoustical situation on site may compel you to stop the measurement session and to take home insufficient (at first sight) or partly incorrect measurement data. Nevertheless, with some additional effort, it is still possible in many cases to derive sufficient, albeit not fully standard compliant information from the measurement results. If the measurement results are to be used for scientific research purposes, then you have to make sure that the measurements can be carried out with the highest possible accuracy. In this case it is important to quickly recognize certain effects, such as those due to the acoustics or deficiencies in the measuring equipment, and to decide and act accordingly. Knowledge as well as routine is required.