Dragon Ball 35-36 - Muscle Tower!

35:41 This scene appears in the manga too. It's Toriyama's unique way of foreshadowing. He'd introduce an ambiguous idea and clarify it later. So to us it seems like proper foreshadowing, but in reality he's just coming up with it as he goes along.

the staff was his grandpa's

He is based on Sun Wukong, the monkey king from Journey to the West, hence the monkey theme. The extending staff and Nimbus are also things Sun Wukong use