Beware the Nice Ones: Margarine turns into... Wargarine. She makes short work of the Mook Lieutenant that was close to killing the heroes five minutes before.
France Robo's appearance is a complete homage to the launch sequence of Mazinger Z.
When Red's cockpit moves after the big robot combination, it looks remarkably similar to Duke Freed's "Chute In" sequence from when he'd activate Grendizer (probably more appropriate to say...invokedGoldorak).
Speaking of which, the password to make the robots combine? alea jacta est (lit. "The Die Is Cast") — a regular catchphrase in Asterix.
The final battle has several visual nods to Episodes 5 and 6 of GunBuster.
Torso with a View: Succulard (although the chain wrapped around him is undamaged...).