Banjo-Tooie Easter Egg - Sabreman cameo

In the level Hailfire Peaks you come across a frozen explorer on the icy side of the level. Once you thaw him out, he will go on to explain that his name is Sabreman and he has been frozen since 1984. Sabreman was the main character in the game Sabre Wulf which was released in 1984 by Rare (then known as Ultimate) who also obviously develop Banjo Tooie.