Methods, algorithms, database structures, and reports for informing consumers of changes in times and channels at which episodes of a television (TV) series are aired on television each week. Based on prior TV listings, an expected time-channel (i.e., day-of-week, time, and channel) for airing a TV series is derived. Actual time-channels for a given week are compared with the expected time-channels to determine whether a deviation from the expected time-channel has occurred. If the deviation has occurred, then the deviation is classified, stored in a database, and transferred to a report that shows a list of such deviations for various TV series.