The Canadian flag has only been around since 1965. Before that, there wasn’t any official flag.
Graffiti is plural. The singular form of the word is graffito.
The first Wrigley Field wasn’t in Chicago . . . a baseball park in Los Angeles called Wrigley Field opened in 1925. The Cubs’ stadium was called Cubs Park at that point, but changed its name to Wrigley Field in 1926. The L.A. one was torn down in 1969.