Or between "Space Seed"/TOS in general and TWOK. How come Khan's multiethnic followers are now all white and blond? How come they're in their early 20s when they were stranded as adults 15 years earlier? How does Khan know Chekov? Why is the Starfleet equipment and apparel among the refugees' supplies movie-era instead of TV-era? How can Kirk say he's "never faced death" after losing Gary Mitchell, Edith Keeler, his own brother and sister-in-law, his wife Miramanee, and his unborn child, not to mention dozens of people under his command? Back then, the movies' concern for continuity with TOS was fairly relaxed; it was seen more as a starting template than a strict gospel.