The camera focuses on this car freshener at various points in Ocean's Eleven:
What's the significance of the car freshener?
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That car freshener hints at the existance of a certain vehicle that cannot yet be shown to us without spoiling the big surprise:
The car freshener is later shown to be hanging in the SWAT team transporter, which the team uses to stage their getaway with the money.
So even though we cannot really draw any conclusions from this visual signifier that early in the film, it makes for a more satisfying experience to at least have been shown some evidence of something more going on in the background, thus making us feel a little complicit.