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No you will not get air mixed in your gas.
Like robbiewt said, it's more like blowing bubbles in watter, the bubbles will NOT last long.
but... as your filling the air that is in the tank needs to come out as the gas takes up the space. the air rushing out faster due to a fast fill can "Some times" in "Some cars" can cause some gas to get splashed back onto the fill nozzle. the pump will shut off thinking fuel is now up to the nozzle and shut off to prevent an over flow.
in the past I have had cars that if I did not place the nozzle in the fill tube at the right angle the air would catch some of the gas and shut off the pump to soon.
at some point you will have a pump shut off to soon and it's most always due to air rushing out.
to avoid that and get a fill to a consistent point each time I pump slow. less splashing = more consistent fill point = better ability to accurately calculate my FE.
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