Angels in the Outfield (1994)

Continuity mistake: In the last game of the movie you can see that Ray Mitchell (Angel Player) hits a home run to tie the game. If you look you can see that the home run ball goes over the fence and out of the stadium but then after they change cameras to Ray and then back to where he hit the home run it shows a man with the ball in his hand as if he caught it.

Roger Bomman: David, I need a drink.
David Montagne: You have drinks.
Roger Bomman: I don't want this, I want something else.
David Montagne: What else?
Roger Bomman: Uh... coffee.
David Montagne: You drink coffee?
Roger Bomman: Yeah, of course. All the time.
JP: Yeah, all the time! What do you think we are? Little kids or something? Now give me a cup or I'll scream.
David Montagne: How do you take it?
Roger Bomman: In cups.

Trivia: At the end of the movie, Carney Lansford spits out chewing tobacco. In reality, they used black liquorice to obtain the same look without having to use the real thing.

Question: What did Al mean when he told Roger to keep his nose clean? I've heard this expression somewhere else but I just don't understand what it means.