Fake Brit: Private's VA, James Patrick Stuart, is from California and is only half-British. Lampshaded during "Hard Boiled Eggy" when Skipper notes Eggy picked up "an adorably fake British accent" from Private.
Mason's VA is American, and according to Private, Mason himself is secretly Canadian.
Missing Episode: Several episodes appeared on DVD and/or Nickelodeon's website well before they made it to air. The last two episodes to be considered "missing" were "Truth Ache" and "Command Crisis", which appeared on the show's first DVD compilation but didn't air until November 2010.
The Other Darrin: Among the eight voiced characters common to the films and the TV series (as mentioned, Phil doesn't talk), four have the same voice actors across the board: Tom McGrath (Skipper), John DiMaggio (Rico), Andy Richter (Mort) and Conrad Vernon (Mason). DreamWorks staff members Chris Miller (Kowalski) and Chris Knights (Private) were respectively replaced by Jeff Bennett and James Patrick Stuart; Kevin Michael Richardson took over Maurice's role from Cedric the Entertainer; and Danny Jacobs replaced Sacha Baron Cohen as King Julien.