 The movie features errors in continuity when compared to " Space Seed " . Because of re @-@ casting , Khan 's followers appear not to have aged from their appearance in the episode and Khan recognises Pavel Chekov — the character did not join Star Trek until season two , after this episode took place . This latter error was described in Deborah Cartmell and Imelda Whelehan 's book Adaptations : From Text to Screen , Screen to Text as the " gaff notorious throughout Star Trek fandom " . An explanation was presented in the novelization of The Wrath of Khan , which stated that Chekov was working on the night shift at the time . 
