We all know Oda has an incredible talent of foreshadowing and other details that later come in to play. So I thought I'd create this thread to discuss such things.
For an example, in the past Usopp lied about fighting giant goldfish and bordered their manewer, thinking it was land. Later, the Elbaf giants confirmed that they had actually been on such adventures. Then, after Zoro's battle with Mr.1, Mr.1 asked if Zoro was going to cut through diamond next. Now, the battle between Mihawk and "Diamond" Joz begins.
What things that have been mentioned in the past do you think will come into play later?
I'll start off by mentioning this. Don Krieg noted on Zeff leaving foot prints in iron. I think Sanji will do this at some point in the future, perhaps as a small detail in the middle of a battle.
http://www.onemanga.com/One_Piece/48/03/
Now you. What things will come into play later?
