I hate a typo.

I always find typo after print out. Even after I submit an important board I find one. Why? Everybody feels the same way with me? I made a board for client last week. My boss said today that there was a type so that the client wanted us to fix it and print out new board.
Yes, it is my fault. I checked it before I sent to printer, but it always happens. why? why? I have to invest more time to check spelling. One of my bosses said we, architects, are graphic people so we can't catch typos quickly. When we give away our drawings or board or whatever our work we have to have double, triple check typo, because more of clients are text-oriented people.

Can you find a typo in the picture? There is a typo. I don't know if it is apple's mistake or by design.