The mascot for Red Beer changes midway through the series from a Native American to an Eagle.
Sterling Archer: Lana!
Sterling Archer: LANAAAAAAAAAA!
Lana Kane: WHAT?
Sterling Archer: Danger Zone
In "El Secuestro" (Season 2), Brett's voice match on the call with the kidnappers shows his full name as "Brett Buckley." In "White Elephant"(Season 5), Brett's last name is stated by the FBI as "Bunson," causing Archer to remember the Muppet character Bunsen Honeydew.