Pat Lawlor games always have fun references, with the most mysterious one being "hand on button." On Whirlwind's playfield, there's a street sign that says "Visit the Fault" referencing Earthshaker (upper left-hand corner).

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Roadshow, as an homage to Whirlwind's "Storm Blasters: Anytime... Anywhere" has "Road Busters: Anytime... Anywhere."

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I know Twilight Zone's radio plays tunes and callouts from games like Earthshaker and Whirlwind as well; and as mentioned before, Junk Yard has modes like "The Mamushka" "Move Your Car!" "Saucer Attack" and "Payback Time" from TAF, CftBL, AFM, and T2 respectively.

Taxi has Pinbot as a pickup.

Oh! And a more obscure reference is that Gottlieb's Lights, Camera, Action has Bone Buster characters in the inlanes (the last 'official' game Gottlieb made before switching to System 3).

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