1. Tangible, non-transitory, computer-readable media having stored thereon instructions executable by a computing device to perform functions comprising: causing a graphical display to display one or more prompts to initiate calibration of at least one playback device within a given environment; after displaying the one or more prompts to initiate calibration of the at least one playback device within the given environment, receiving, via a microphone, audio data comprising an audio signal component emitted by the at least one playback device; while receiving the audio data, determining, based on at least a subset of the audio data, that an error condition has occurred, wherein determining that the error condition has occurred comprises: determining that a rate of variation in a level of the audio signal component exceeds a maximum threshold level for calibrating the at least one playback device; and based on determining that the rate of variation in the level of the audio signal component exceeds the maximum threshold level for calibrating the at least one playback device, identifying the error condition as a condition corresponding to overly-fast movement of the computing device within the given environment during calibration of the at least one playback device; and in response to determining that the error condition has occurred, causing the graphical display to display a graphical representation that indicates the error condition corresponding to overly-fast movement of the computing device within the given environment during calibration of the at least one playback device.