The strange, not US like papermoney bills Gus uses in the film are Dutch Guilders, money from The Netherlands from the pre-Euro period.
Filmed in December of 1990, and made the rounds at a few festivals, but didn't get a proper release until January 1993.
Flea from the Red Hot Chili Peppers is the bus boy in a diner that the boy comes across.
Drew Barrymore was only 15 years old at the time of production.