• Dawson Casting:
    • Averted, there is some variation on the exact ages between child actors and their characters but generally its teenagers playing teenagers. What's interesting is that Frankie Muniz (Malcolm) is actually a year older than Justin Berfield (Reese). Not that obvious early in the series (it's likely why he was cast as Reese), but Berfield remained taller than Muniz throughout the series run.
    • Played straight in one of the last episodes, where Malcolm organizes an alternative prom with a high school character played by a 26 year old actress.
    • Emy Coligado was in her 30s when she started playing 19 year old Piama.
  • Unintentional Period Piece: The show itself does fairly well to steer away from pop culture references and the like which usually dates these sort of shows, but the actual show soundtrack (consisting of bands like Sum 41 and similar era bands) grounds it into the early 2000s.