: The season opens with a massive three-part crossover event involving FBI: Most Wanted and FBI: International , which fans found action-packed and epic.

: Some regional DVD releases (like the UK set) may appear to have only 21 episodes instead of 22. This is because the intended finale, "Prodigal Son," was pulled from its original US airing and later moved to Season 5.

: Some viewers on Rotten Tomatoes criticize the season for being formulaic, citing repetitive "shouting FBI" foot chases and predictable plot beats in every episode.