While watching Pops gambling in Atlantic City in "1980 something", Beverly Goldberg and Bill Lewis are shown hiding behind a row of coinless slot machines. Coinless slots were not available until 2002.
On Marsh 20th 1980-something there where still only 50 states in the US even though Johnny Atkins claims that "We could go to jail in all 54 states just for playing..." Leisure Suit Larry.