Are you talking about throw-in spots or just the desginated spot? Pretty much a player in the NBA is allowed a step to the left or right as long as they a part of their body over the spot.
The spot isn't really defined like it is in NFHS (3 feet wide, etc). I'm pretty sure the designated spot is the spot where the official points.
As far as signals, the official will point to the spot like we do in Fed. If there's a violation, there is no particular signal to signal it. Some will give the travel signal or just point to the spot.
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